diff --git a/src/libponyc/expr/match.c b/src/libponyc/expr/match.c
index 7d16066f..c2ec7056 100644
--- a/src/libponyc/expr/match.c
+++ b/src/libponyc/expr/match.c
@@ -314,8 +314,10 @@ static ast_t* make_pattern_type(pass_opt_t* opt, ast_t* pattern)
     case TK_DONTCAREREF:
     case TK_MATCH_CAPTURE:
     case TK_MATCH_DONTCARE:
+      if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
       return pattern_type;

+
     case TK_TUPLE:
     {
       ast_t* pattern_child = ast_child(pattern);

Instruction:
<uploaded_files>
/workspace/ponylang__ponyc__0.1
</uploaded_files>
I've uploaded a C code repository in the directory ponylang__ponyc__0.1. Consider the following issue description:

<issue_description>
Incorrect aliasing of iso when using match
I don't think a field should be consumable, but [this code](https://playground.ponylang.io/?gist=8851afb5cabae5df91a979048f765601) compiles and gives rise to arbitrarily many copies of an iso reference to one object, breaking the isolation guarantees.

The particular function that should be caught by the function is this one:
```pony
fun ref take(): Foo iso^ =>
    // consume _foo  // <- compiler error
    match _foo
    | let b: Foo => consume b   // ... no compiler error?
    end
```

```
$ ponyc -v
0.58.9-cabe71e [release]
Compiled with: LLVM 15.0.7 -- Clang-18.1.3-x86_64
Defaults: pic=true
```
</issue_description>

Can you help me implement the necessary changes to the repository so that the requirements specified in the <issue_description> are met?
I've already taken care of all changes to any of the test files described in the <issue_description>. This means you DON'T have to modify the testing logic or any of the tests in any way!
Also the development C environment is already set up for you (i.e., all dependencies already installed), so you don't need to install other packages.
Your task is to make the minimal changes to non-test files in the /workspace directory to ensure the <issue_description> is satisfied.
Follow these steps to resolve the issue:
1. As a first step, it might be a good idea to explore the repo to familiarize yourself with its structure.
2. Create a script to reproduce the error by compiling your C code (for example, using `gcc <filename.c> -o <executable>`) and then running the executable using the BashTool, to confirm the error.
3. Edit the sourcecode of the repo to resolve the issue.
4. Rerun your reproduce script and confirm that the error is fixed!
5. Think about edgecases, add comprehensive tests for them in your reproduce script, and run them to make sure your fix handles them as well.
6. Once you are done with the initial implementation, please carefully re-read the problem description and check the difference between the current code and the base commit e5398b7ab793e2b11f930aa375b9212887614b03. Do you think that the issue has been completely and comprehensively solved? Write tests to check the correctness of the solution, specifically focusing on tests that may point out any remaining problems that are not yet solved. Run all of the tests in the repo and check if any of them fail, and if they do fix the code. Repeat this process of carefully reading the problem description and current implementation, testing, and fixing any problems until you are confident that the current implementation is correct. Find and run any tests in the repo that are related to:
   - The issue you are fixing
   - The files you modified
   - The functions you changed
   Make sure all these tests pass with your changes.
Your thinking should be thorough and so it's fine if it's very long.

You are OpenHands agent, a helpful AI assistant that can interact with a computer to solve tasks.

<ROLE>
Your primary role is to assist users by executing commands, modifying code, and solving technical problems effectively. You should be thorough, methodical, and prioritize quality over speed.
* If the user asks a question, like "why is X happening", don't try to fix the problem. Just give an answer to the question.
</ROLE>

<EFFICIENCY>
* Each action you take is somewhat expensive. Wherever possible, combine multiple actions into a single action, e.g. combine multiple bash commands into one, using sed and grep to edit/view multiple files at once.
* When exploring the codebase, use efficient tools like find, grep, and git commands with appropriate filters to minimize unnecessary operations.
</EFFICIENCY>

<FILE_SYSTEM_GUIDELINES>
* When a user provides a file path, do NOT assume it's relative to the current working directory. First explore the file system to locate the file before working on it.
* If asked to edit a file, edit the file directly, rather than creating a new file with a different filename.
* For global search-and-replace operations, consider using `sed` instead of opening file editors multiple times.
</FILE_SYSTEM_GUIDELINES>

<CODE_QUALITY>
* Write clean, efficient code with minimal comments. Avoid redundancy in comments: Do not repeat information that can be easily inferred from the code itself.
* When implementing solutions, focus on making the minimal changes needed to solve the problem.
* Before implementing any changes, first thoroughly understand the codebase through exploration.
* If you are adding a lot of code to a function or file, consider splitting the function or file into smaller pieces when appropriate.
</CODE_QUALITY>

<VERSION_CONTROL>
* When configuring git credentials, use "openhands" as the user.name and "openhands@all-hands.dev" as the user.email by default, unless explicitly instructed otherwise.
* Exercise caution with git operations. Do NOT make potentially dangerous changes (e.g., pushing to main, deleting repositories) unless explicitly asked to do so.
* When committing changes, use `git status` to see all modified files, and stage all files necessary for the commit. Use `git commit -a` whenever possible.
* Do NOT commit files that typically shouldn't go into version control (e.g., node_modules/, .env files, build directories, cache files, large binaries) unless explicitly instructed by the user.
* If unsure about committing certain files, check for the presence of .gitignore files or ask the user for clarification.
</VERSION_CONTROL>

<PULL_REQUESTS>
* When creating pull requests, create only ONE per session/issue unless explicitly instructed otherwise.
* When working with an existing PR, update it with new commits rather than creating additional PRs for the same issue.
* When updating a PR, preserve the original PR title and purpose, updating description only when necessary.
</PULL_REQUESTS>

<PROBLEM_SOLVING_WORKFLOW>
1. EXPLORATION: Thoroughly explore relevant files and understand the context before proposing solutions
2. ANALYSIS: Consider multiple approaches and select the most promising one
3. TESTING:
   * For bug fixes: Create tests to verify issues before implementing fixes
   * For new features: Consider test-driven development when appropriate
   * If the repository lacks testing infrastructure and implementing tests would require extensive setup, consult with the user before investing time in building testing infrastructure
   * If the environment is not set up to run tests, consult with the user first before investing time to install all dependencies
4. IMPLEMENTATION: Make focused, minimal changes to address the problem
5. VERIFICATION: If the environment is set up to run tests, test your implementation thoroughly, including edge cases. If the environment is not set up to run tests, consult with the user first before investing time to run tests.
</PROBLEM_SOLVING_WORKFLOW>

<SECURITY>
* Only use GITHUB_TOKEN and other credentials in ways the user has explicitly requested and would expect.
* Use APIs to work with GitHub or other platforms, unless the user asks otherwise or your task requires browsing.
</SECURITY>

<ENVIRONMENT_SETUP>
* When user asks you to run an application, don't stop if the application is not installed. Instead, please install the application and run the command again.
* If you encounter missing dependencies:
  1. First, look around in the repository for existing dependency files (requirements.txt, pyproject.toml, package.json, Gemfile, etc.)
  2. If dependency files exist, use them to install all dependencies at once (e.g., `pip install -r requirements.txt`, `npm install`, etc.)
  3. Only install individual packages directly if no dependency files are found or if only specific packages are needed
* Similarly, if you encounter missing dependencies for essential tools requested by the user, install them when possible.
</ENVIRONMENT_SETUP>

<TROUBLESHOOTING>
* If you've made repeated attempts to solve a problem but tests still fail or the user reports it's still broken:
  1. Step back and reflect on 5-7 different possible sources of the problem
  2. Assess the likelihood of each possible cause
  3. Methodically address the most likely causes, starting with the highest probability
  4. Document your reasoning process
* When you run into any major issue while executing a plan from the user, please don't try to directly work around it. Instead, propose a new plan and confirm with the user before proceeding.
</TROUBLESHOOTING>

Execute a bash command in the terminal within a persistent shell session.

### Command Execution
* One command at a time: You can only execute one bash command at a time. If you need to run multiple commands sequentially, use `&&` or `;` to chain them together.
* Persistent session: Commands execute in a persistent shell session where environment variables, virtual environments, and working directory persist between commands.
* Timeout: Commands have a soft timeout of 120 seconds, once that's reached, you have the option to continue or interrupt the command (see section below for details)

### Running and Interacting with Processes
* Long running commands: For commands that may run indefinitely, run them in the background and redirect output to a file, e.g. `python3 app.py > server.log 2>&1 &`.
* Interact with running process: If a bash command returns exit code `-1`, this means the process is not yet finished. By setting `is_input` to `true`, you can:
  - Send empty `command` to retrieve additional logs
  - Send text (set `command` to the text) to STDIN of the running process
  - Send control commands like `C-c` (Ctrl+C), `C-d` (Ctrl+D), or `C-z` (Ctrl+Z) to interrupt the process

### Best Practices
* Directory verification: Before creating new directories or files, first verify the parent directory exists and is the correct location.
* Directory management: Try to maintain working directory by using absolute paths and avoiding excessive use of `cd`.

### Output Handling
* Output truncation: If the output exceeds a maximum length, it will be truncated before being returned.

The bash command to execute. Can be empty string to view additional logs when previous exit code is `-1`. Can be `C-c` (Ctrl+C) to interrupt the currently running process. Note: You can only execute one bash command at a time. If you need to run multiple commands sequentially, you can use `&&` or `;` to chain them together.

If True, the command is an input to the running process. If False, the command is a bash command to be executed in the terminal. Default is False.

think

Use the tool to think about something. It will not obtain new information or make any changes to the repository, but just log the thought. Use it when complex reasoning or brainstorming is needed.

Common use cases:
1. When exploring a repository and discovering the source of a bug, call this tool to brainstorm several unique ways of fixing the bug, and assess which change(s) are likely to be simplest and most effective.
2. After receiving test results, use this tool to brainstorm ways to fix failing tests.
3. When planning a complex refactoring, use this tool to outline different approaches and their tradeoffs.
4. When designing a new feature, use this tool to think through architecture decisions and implementation details.
5. When debugging a complex issue, use this tool to organize your thoughts and hypotheses.

The tool simply logs your thought process for better transparency and does not execute any code or make changes.

The thought to log.

finish

Signals the completion of the current task or conversation.

Use this tool when:
- You have successfully completed the user's requested task
- You cannot proceed further due to technical limitations or missing information

The message should include:
- A clear summary of actions taken and their results
- Any next steps for the user
- Explanation if you're unable to complete the task
- Any follow-up questions if more information is needed

The task_completed field should be set to True if you believed you have completed the task, and False otherwise.

Final message to send to the user

Whether you have completed the task.

Custom editing tool for viewing, creating and editing files in plain-text format
* State is persistent across command calls and discussions with the user
* If `path` is a file, `view` displays the result of applying `cat -n`. If `path` is a directory, `view` lists non-hidden files and directories up to 2 levels deep
* The `create` command cannot be used if the specified `path` already exists as a file
* If a `command` generates a long output, it will be truncated and marked with `<response clipped>`
* The `undo_edit` command will revert the last edit made to the file at `path`

Before using this tool:
1. Use the view tool to understand the file's contents and context
2. Verify the directory path is correct (only applicable when creating new files):
   - Use the view tool to verify the parent directory exists and is the correct location

When making edits:
   - Ensure the edit results in idiomatic, correct code
   - Do not leave the code in a broken state
   - Always use absolute file paths (starting with /)

CRITICAL REQUIREMENTS FOR USING THIS TOOL:

1. EXACT MATCHING: The `old_str` parameter must match EXACTLY one or more consecutive lines from the file, including all whitespace and indentation. The tool will fail if `old_str` matches multiple locations or doesn't match exactly with the file content.

2. UNIQUENESS: The `old_str` must uniquely identify a single instance in the file:
   - Include sufficient context before and after the change point (3-5 lines recommended)
   - If not unique, the replacement will not be performed

3. REPLACEMENT: The `new_str` parameter should contain the edited lines that replace the `old_str`. Both strings must be different.

Remember: when making multiple file edits in a row to the same file, you should prefer to send all edits in a single message with multiple calls to this tool, rather than multiple messages with a single call each.

The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`, `undo_edit`.

Absolute path to file or directory, e.g. `/workspace/file.py` or `/workspace`.

Required parameter of `create` command, with the content of the file to be created.

Required parameter of `str_replace` command containing the string in `path` to replace.

Optional parameter of `str_replace` command containing the new string (if not given, no string will be added). Required parameter of `insert` command containing the string to insert.

Required parameter of `insert` command. The `new_str` will be inserted AFTER the line `insert_line` of `path`.

Optional parameter of `view` command when `path` points to a file. If none is given, the full file is shown. If provided, the file will be shown in the indicated line number range, e.g. [11, 12] will show lines 11 and 12. Indexing at 1 to start. Setting `[start_line, -1]` shows all lines from `start_line` to the end of the file.

Retrieving content for: <uploaded_files>
/workspace/ponylang__ponyc__0.1
<

Question:
<uploaded_files>
/workspace/ponylang__ponyc__0.1
</uploaded_files>
I've uploaded a C code repository in the directory ponylang__ponyc__0.1. Consider the following issue description:

<issue_description>
Incorrect aliasing of iso when using match
I don't think a field should be consumable, but [this code](https://playground.ponylang.io/?gist=8851afb5cabae5df91a979048f765601) compiles and gives rise to arbitrarily many copies of an iso reference to one object, breaking the isolation guarantees.

The particular function that should be caught by the function is this one:
```pony
fun ref take(): Foo iso^ =>
    // consume _foo  // <- compiler error
    match _foo
    | let b: Foo => consume b   // ... no compiler error?
    end
```

```
$ ponyc -v
0.58.9-cabe71e [release]
Compiled with: LLVM 15.0.7 -- Clang-18.1.3-x86_64
Defaults: pic=true
```
</issue_description>

Can you help me implement the necessary changes to the repository so that the requirements specified in the <issue_description> are met?
I've already taken care of all changes to any of the test files described in the <issue_description>. This means you DON'T have to modify the testing logic or any of the tests in any way!
Also the development C environment is already set up for you (i.e., all dependencies already installed), so you don't need to install other packages.
Your task is to make the minimal changes to non-test files in the /workspace directory to ensure the <issue_description> is satisfied.
Follow these steps to resolve the issue:
1. As a first step, it might be a good idea to explore the repo to familiarize yourself with its structure.
2. Create a script to reproduce the error by compiling your C code (for example, using `gcc <filename.c> -o <executable>`) and then running the executable using the BashTool, to confirm the error.
3. Edit the sourcecode of the repo to resolve the issue.
4. Rerun your reproduce script and confirm that the error is fixed!
5. Think about edgecases, add comprehensive tests for them in your reproduce script, and run them to make sure your fix handles them as well.
6. Once you are done with the initial implementation, please carefully re-read the problem description and check the difference between the current code and the base commit e5398b7ab793e2b11f930aa375b9212887614b03. Do you think that the issue has been completely and comprehensively solved? Write tests to check the correctness of the solution, specifically focusing on tests that may point out any remaining problems that are not yet solved. Run all of the tests in the repo and check if any of them fail, and if they do fix the code. Repeat this process of carefully reading the problem description and current implementation, testing, and fixing any problems until you are confident that the current implementation is correct. Find and run any tests in the repo that are related to:
   - The issue you are fixing
   - The files you modified
   - The functions you changed
   Make sure all these tests pass with your changes.
Your thinking should be thorough and so it's fine if it's very long.

Added workspace context

Added workspace context

Running command: cd /workspace/ponylang__ponyc__0.1 && ls -l

The task involves exploring the given C code repository in the `/workspace/ponylang__ponyc__0.1` directory, understanding the issue described, and making the necessary changes to resolve it. The issue is related to incorrect aliasing of `iso` when using `match` in the Pony language compiler.

First, I need to explore the repository to familiarize myself with its structure.

cd /workspace/ponylang__ponyc__0.1 && ls -l

Command `cd /workspace/ponylang__ponyc__0.1 && ls -l` executed with exit code 0.

total 296
-rw-r--r--  1 root root   9336 Apr 30 09:56 BUILD.md
-rw-r--r--  1 root root 106489 Apr 30 09:56 CHANGELOG.md
-rw-r--r--  1 root root  10531 Apr 30 09:56 CMakeLists.txt
-rw-r--r--  1 root root   6612 Apr 30 09:56 CODE_OF_CONDUCT.md
-rw-r--r--  1 root root   8761 Apr 30 09:56 CONTRIBUTING.md
-rw-r--r--  1 root root   1612 Apr 30 09:56 EDITORS.md
-rw-r--r--  1 root root   5372 Apr 30 09:56 INSTALL.md
-rw-r--r--  1 root root   2703 Apr 30 09:56 INSTALL_DOCKER.md
-rw-r--r--  1 root root   1350 Apr 30 09:56 LICENSE
-rw-r--r--  1 root root  15021 Apr 30 09:56 Makefile
-rw-r--r--  1 root root   1965 Apr 30 09:56 README.md
-rw-r--r--  1 root root   5060 Apr 30 09:56 RELEASE_PROCESS.md
-rw-r--r--  1 root root  18869 Apr 30 09:56 STYLE_GUIDE.md
-rw-r--r--  1 root root   1837 Apr 30 09:56 SUPPORT.md
-rw-r--r--  1 root root   3169 Apr 30 09:56 SYSTEMATIC_TESTING.md
-rw-r--r--  1 root root      7 Apr 30 09:56 VERSION
drwxr-xr-x  4 root root   4096 Apr 30 09:56 benchmark
drwxr-xr-x 36 root root   4096 Apr 30 09:56 examples
drwxr-xr-x  4 root root   4096 Apr 30 09:56 lib
-rw-r--r--  1 root root  20613 Apr 30 09:56 make.ps1
drwxr-xr-x  4 root root   4096 Apr 30 09:56 minimal-cases
drwxr-xr-x 34 root root   4096 Apr 30 09:56 packages
-rw-r--r--  1 root root    142 Apr 30 09:56 pony.cloc
-rw-r--r--  1 root root  11094 Apr 30 09:56 pony.g
drwxr-xr-x  6 root root   4096 Apr 30 09:56 src
drwxr-xr-x  7 root root   4096 Apr 30 09:56 test

[The command completed with exit code 0.]

Running command: cd /workspace/ponylang__ponyc__0.1/src && ls -l

The repository is a Pony language compiler written in C. The issue described is related to incorrect aliasing of `iso` when using `match`. To start, I need to understand how the Pony compiler handles `iso` and `match` expressions.

Let's explore the `src` directory, which likely contains the source code for the compiler.

cd /workspace/ponylang__ponyc__0.1/src && ls -l

Command `cd /workspace/ponylang__ponyc__0.1/src && ls -l` executed with exit code 0.

total 16
drwxr-xr-x  3 root root 4096 Apr 30 09:56 common
drwxr-xr-x 13 root root 4096 Apr 30 09:56 libponyc
drwxr-xr-x 11 root root 4096 Apr 30 09:56 libponyrt
drwxr-xr-x  2 root root 4096 Apr 30 09:56 ponyc

Running command: cd /workspace/ponylang__ponyc__0.1/src/libponyc && ls -l

The `src` directory contains several subdirectories, including `libponyc`, which is likely the directory containing the Pony compiler implementation. Let's explore `libponyc` to understand its structure.

cd /workspace/ponylang__ponyc__0.1/src/libponyc && ls -l

The `src` directory contains several subdirectories, including `libponyc`, which is likely the directory containing the Pony compiler implementation. Let's explore `libponyc` to understand its structure.

Command `cd /workspace/ponylang__ponyc__0.1/src/libponyc && ls -l` executed with exit code 0.

total 168
-rw-r--r-- 1 root root  9545 Apr 30 09:56 CMakeLists.txt
drwxr-xr-x 2 root root  4096 Apr 30 09:56 ast
drwxr-xr-x 2 root root  4096 Apr 30 09:56 codegen
drwxr-xr-x 2 root root  4096 Apr 30 09:56 expr
-rw-r--r-- 1 root root 98767 Apr 30 09:56 logo.h
drwxr-xr-x 2 root root  4096 Apr 30 09:56 options
drwxr-xr-x 2 root root  4096 Apr 30 09:56 pass
drwxr-xr-x 2 root root  4096 Apr 30 09:56 pkg
drwxr-xr-x 2 root root  4096 Apr 30 09:56 platform
drwxr-xr-x 2 root root  4096 Apr 30 09:56 plugin
-rw-r--r-- 1 root root   490 Apr 30 09:56 ponyc.c
-rw-r--r-- 1 root root   207 Apr 30 09:56 ponyc.h
-rw-r--r-- 1 root root  1188 Apr 30 09:56 ponydoc.c
drwxr-xr-x 2 root root  4096 Apr 30 09:56 reach
drwxr-xr-x 2 root root  4096 Apr 30 09:56 type
drwxr-xr-x 2 root root  4096 Apr 30 09:56 verify

Running command: cd /workspace/ponylang__ponyc__0.1/src/libponyc/expr && ls -l

The `libponyc` directory contains several subdirectories related to different stages of the compilation process, including `ast`, `expr`, `pass`, `verify`, etc. The issue described is related to incorrect aliasing of `iso` when using `match`, which suggests that the problem lies in the way the compiler handles expressions or type checking.

Let's explore the `expr` directory, which likely contains code related to expression handling in the Pony language.

cd /workspace/ponylang__ponyc__0.1/src/libponyc/expr && ls -l

Command `cd /workspace/ponylang__ponyc__0.1/src/libponyc/expr && ls -l` executed with exit code 0.

total 244
-rw-r--r-- 1 root root 16453 Apr 30 09:56 array.c
-rw-r--r-- 1 root root   273 Apr 30 09:56 array.h
-rw-r--r-- 1 root root 27630 Apr 30 09:56 call.c
-rw-r--r-- 1 root root   334 Apr 30 09:56 call.h
-rw-r--r-- 1 root root 12405 Apr 30 09:56 control.c
-rw-r--r-- 1 root root   785 Apr 30 09:56 control.h
-rw-r--r-- 1 root root  4573 Apr 30 09:56 ffi.c
-rw-r--r-- 1 root root   262 Apr 30 09:56 ffi.h
-rw-r--r-- 1 root root 22299 Apr 30 09:56 lambda.c
-rw-r--r-- 1 root root   265 Apr 30 09:56 lambda.h
-rw-r--r-- 1 root root 26514 Apr 30 09:56 literal.c
-rw-r--r-- 1 root root  1699 Apr 30 09:56 literal.h
-rw-r--r-- 1 root root 16360 Apr 30 09:56 match.c
-rw-r--r-- 1 root root   355 Apr 30 09:56 match.h
-rw-r--r-- 1 root root 18901 Apr 30 09:56 operator.c
-rw-r--r-- 1 root root   359 Apr 30 09:56 operator.h
-rw-r--r-- 1 root root 13359 Apr 30 09:56 postfix.c
-rw-r--r-- 1 root root   360 Apr 30 09:56 postfix.h
-rw-r--r-- 1 root root 26479 Apr 30 09:56 reference.c
-rw-r--r-- 1 root root  1003 Apr 30 09:56 reference.h

Reading file: /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

The `expr` directory contains several files related to expression handling in the Pony language, including `match.c`, which is likely responsible for handling `match` expressions. This file is a good candidate to investigate the issue described.

Let's examine the contents of `match.c` to understand how it handles `iso` and `match` expressions.

I read the file /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c:
     1	#include "match.h"
     2	#include "literal.h"
     3	#include "../type/subtype.h"
     4	#include "../type/assemble.h"
     5	#include "../type/matchtype.h"
     6	#include "../type/alias.h"
     7	#include "../type/lookup.h"
     8	#include "../ast/astbuild.h"
     9	#include "../ast/stringtab.h"
    10	#include "../ast/id.h"
    11	#include "../expr/control.h"
    12	#include "../expr/reference.h"
    13	#include "../pass/expr.h"
    14	#include "../pass/pass.h"
    15	#include "ponyassert.h"
    16
    17
    18	static bool case_expr_matches_type_alone(pass_opt_t* opt, ast_t* case_expr)
    19	{
    20	  switch(ast_id(case_expr))
    21	  {
    22	    // These pattern forms match on type alone.
    23	    case TK_MATCH_CAPTURE:
    24	    case TK_MATCH_DONTCARE:
    25	      return true;
    26
    27	    // This pattern form matches any type (ignoring the value entirely).
    28	    case TK_DONTCAREREF:
    29	      return true;
    30
    31	    // Tuple patterns may contain a mixture of matching on types and values,
    32	    // so we only return true if *all* elements return true.
    33	    case TK_TUPLE:
    34	      for(ast_t* e = ast_child(case_expr); e != NULL; e = ast_sibling(e))
    35	        if(!case_expr_matches_type_alone(opt, e))
    36	          return false;
    37	      return true;
    38
    39	    // This pattern form matches on type alone if the final child returns true.
    40	    case TK_SEQ:
    41	      return case_expr_matches_type_alone(opt, ast_childlast(case_expr));
    42
    43	    default: {}
    44	  }
    45
    46	  // For all other case expression forms, we're matching on structural equality,
    47	  // which can only be supported for primitives that use the default eq method,
    48	  // and are not "special" builtin primitives that can have more than one
    49	  // distinct value (machine words).
    50	  // A value expression pattern that meets these conditions may be treated as
    51	  // matching on type alone, because the value is a singleton for that type
    52	  // and the result of the eq method will always be true if the type matches.
    53
    54	  ast_t* type = ast_type(case_expr);
    55
    56	  if(is_typecheck_error(type))
    57	    return false;
    58
    59	  ast_t* def = (ast_t*)ast_data(type);
    60
    61	  if((def == NULL) || (ast_id(def) != TK_PRIMITIVE) || is_machine_word(type))
    62	    return false;
    63
    64	  ast_t* eq_def = ast_get(def, stringtab("eq"), NULL);
    65	  pony_assert(ast_id(eq_def) == TK_FUN);
    66
    67	  ast_t* eq_params = ast_childidx(eq_def, 3);
    68	  pony_assert(ast_id(eq_params) == TK_PARAMS);
    69	  pony_assert(ast_childcount(eq_params) == 1);
    70
    71	  ast_t* eq_body = ast_childidx(eq_def, 6);
    72	  pony_assert(ast_id(eq_body) == TK_SEQ);
    73
    74	  // Expect to see a body containing the following AST:
    75	  //   (is (this) (paramref (id that)))
    76	  // where `that` is the name of the first parameter.
    77	  if((ast_childcount(eq_body) != 1) ||
    78	    (ast_id(ast_child(eq_body)) != TK_IS) ||
    79	    (ast_id(ast_child(ast_child(eq_body))) != TK_THIS) ||
    80	    (ast_id(ast_childidx(ast_child(eq_body), 1)) != TK_PARAMREF))
    81	    return false;
    82
    83	  const char* that_param_name =
    84	    ast_name(ast_child(ast_childidx(ast_child(eq_body), 1)));
    85
    86	  if(ast_name(ast_child(ast_child(eq_params))) != that_param_name)
    87	    return false;
    88
    89	  return true;
    90	}
    91
    92	/**
    93	 * return a pointer to the case expr at which the match can be considered
    94	 * exhaustive or NULL if it is not exhaustive.
    95	 **/
    96	static ast_t* is_match_exhaustive(pass_opt_t* opt, ast_t* expr_type,
    97	  ast_t* cases)
    98	{
    99	  pony_assert(expr_type != NULL);
   100	  pony_assert(ast_id(cases) == TK_CASES);
   101
   102	  // Exhaustive match not yet supported for matches where all cases "jump away".
   103	  // The return/error/break/continue should be moved to outside the match.
   104	  if(ast_checkflag(cases, AST_FLAG_JUMPS_AWAY))
   105	    return NULL;
   106
   107	  // Construct a union of all pattern types that count toward exhaustive match.
   108	  ast_t* cases_union_type = ast_from(cases, TK_UNIONTYPE);
   109	  ast_t* result = NULL;
   110
   111	  for(ast_t* c = ast_child(cases); c != NULL; c = ast_sibling(c))
   112	  {
   113	    AST_GET_CHILDREN(c, case_expr, guard, case_body);
   114	    ast_t* case_type = ast_type(case_expr);
   115
   116	    // if any case is a `_` we have an exhaustive match
   117	    // and we can shortcut here
   118	    if(ast_id(case_expr) == TK_DONTCAREREF)
   119	    {
   120	      result = c;
   121	      break;
   122	    }
   123	    // Only cases with no guard clause can count toward exhaustive match,
   124	    // because the truth of a guard clause can't be statically evaluated.
   125	    // So, for the purposes of exhaustive match, we ignore those cases.
   126	    if(ast_id(guard) != TK_NONE)
   127	      continue;
   128
   129	    // Only cases that match on type alone can count toward exhaustive match,
   130	    // because matches on structural equality can't be statically evaluated.
   131	    // So, for the purposes of exhaustive match, we ignore those cases.
   132	    if(!case_expr_matches_type_alone(opt, case_expr))
   133	      continue;
   134
   135	    // It counts, so add this pattern type to our running union type.
   136	    ast_add(cases_union_type, case_type);
   137
   138	    // If our cases types union is a supertype of the match expression type,
   139	    // then the match must be exhaustive, because all types are covered by cases.
   140	    if(is_subtype(expr_type, cases_union_type, NULL, opt))
   141	    {
   142	      result = c;
   143	      break;
   144	    }
   145	  }
   146
   147	  ast_free_unattached(cases_union_type);
   148	  return result;
   149	}
   150
   151
   152	bool expr_match(pass_opt_t* opt, ast_t* ast)
   153	{
   154	  pony_assert(ast_id(ast) == TK_MATCH);
   155	  AST_GET_CHILDREN(ast, expr, cases, else_clause);
   156
   157	  // A literal match expression should have been caught by the cases, but check
   158	  // again to avoid an assert if we've missed a case
   159	  ast_t* expr_type = ast_type(expr);
   160
   161	  if(is_typecheck_error(expr_type))
   162	    return false;
   163
   164	  if(is_type_literal(expr_type))
   165	  {
   166	    ast_error(opt->check.errors, expr,
   167	      "cannot infer type for literal match expression");
   168	    return false;
   169	  }
   170
   171	  if(is_bare(expr_type))
   172	  {
   173	    ast_error(opt->check.errors, expr,
   174	      "a match operand cannot have a bare type");
   175	    ast_error_continue(opt->check.errors, expr_type,
   176	      "type is %s", ast_print_type(expr_type));
   177	    return false;
   178	  }
   179
   180	  ast_t* type = NULL;
   181
   182	  if(!ast_checkflag(cases, AST_FLAG_JUMPS_AWAY))
   183	  {
   184	    if(is_typecheck_error(ast_type(cases)))
   185	      return false;
   186
   187	    type = control_type_add_branch(opt, type, cases);
   188	  }
   189
   190	  // analyze exhaustiveness
   191	  ast_t* exhaustive_at = is_match_exhaustive(opt, expr_type, cases);
   192
   193	  if(exhaustive_at == NULL)
   194	  {
   195	    // match might not be exhaustive
   196	    if ((ast_id(else_clause) == TK_NONE))
   197	    {
   198	      // If we have no else clause, and the match is not found to be exhaustive,
   199	      // we must generate an implicit else clause that returns None as the value.
   200	      ast_scope(else_clause);
   201	      ast_setid(else_clause, TK_SEQ);
   202
   203	      BUILD(ref, else_clause,
   204	        NODE(TK_TYPEREF,
   205	          NONE
   206	          ID("None")
   207	          NONE));
   208	      ast_add(else_clause, ref);
   209
   210	      if(!expr_typeref(opt, &ref) || !expr_seq(opt, else_clause))
   211	        return false;
   212	    }
   213	  }
   214	  else
   215	  {
   216	    // match is exhaustive
   217	    if(ast_sibling(exhaustive_at) != NULL)
   218	    {
   219	      // we have unreachable cases
   220	      ast_error(opt->check.errors, ast, "match contains unreachable cases");
   221	      ast_error_continue(opt->check.errors, ast_sibling(exhaustive_at),
   222	        "first unreachable case expression");
   223	      return false;
   224	    }
   225	    else if((ast_id(else_clause) != TK_NONE))
   226	    {
   227	      ast_error(opt->check.errors, ast,
   228	        "match is exhaustive, the else clause is unreachable");
   229	      ast_error_continue(opt->check.errors, else_clause,
   230	        "unreachable code");
   231	      return false;
   232	    }
   233	  }
   234
   235	  if((ast_id(else_clause) != TK_NONE))
   236	  {
   237	    if (!ast_checkflag(else_clause, AST_FLAG_JUMPS_AWAY))
   238	    {
   239	      if(is_typecheck_error(ast_type(else_clause)))
   240	        return false;
   241
   242	      type = control_type_add_branch(opt, type, else_clause);
   243	    }
   244	  }
   245
   246	  if((type == NULL) && (ast_sibling(ast) != NULL))
   247	  {
   248	    ast_error(opt->check.errors, ast_sibling(ast), "unreachable code");
   249	    return false;
   250	  }
   251
   252	  ast_settype(ast, type);
   253	  literal_unify_control(ast, opt);
   254
   255	  return true;
   256	}
   257
   258	bool expr_cases(pass_opt_t* opt, ast_t* ast)
   259	{
   260	  pony_assert(ast_id(ast) == TK_CASES);
   261	  ast_t* the_case = ast_child(ast);
   262	  pony_assert(the_case != NULL);
   263
   264	  ast_t* type = NULL;
   265
   266	  while(the_case != NULL)
   267	  {
   268	    AST_GET_CHILDREN(the_case, pattern, guard, body);
   269	    ast_t* body_type = ast_type(body);
   270
   271	    if(!is_typecheck_error(body_type) &&
   272	      !ast_checkflag(body, AST_FLAG_JUMPS_AWAY))
   273	      type = control_type_add_branch(opt, type, body);
   274
   275	    the_case = ast_sibling(the_case);
   276	  }
   277
   278	  ast_settype(ast, type);
   279	  return true;
   280	}
   281
   282	static ast_t* make_pattern_type(pass_opt_t* opt, ast_t* pattern)
   283	{
   284	  if(ast_id(pattern) == TK_NONE)
   285	  {
   286	    ast_t* type = ast_from(pattern, TK_DONTCARETYPE);
   287	    ast_settype(pattern, type);
   288	    return type;
   289	  }
   290
   291	  if(ast_checkflag(pattern, AST_FLAG_JUMPS_AWAY))
   292	  {
   293	    ast_error(opt->check.errors, pattern,
   294	      "not a matchable pattern - the expression jumps away with no value");
   295	    return NULL;
   296	  }
   297
   298	  ast_t* pattern_type = ast_type(pattern);
   299
   300	  if(is_typecheck_error(pattern_type))
   301	    return NULL;
   302
   303	  if(is_bare(pattern_type))
   304	  {
   305	    ast_error(opt->check.errors, pattern,
   306	      "a match pattern cannot have a bare type");
   307	    ast_error_continue(opt->check.errors, pattern_type,
   308	      "type is %s", ast_print_type(pattern_type));
   309	    return NULL;
   310	  }
   311
   312	  switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;
   318
   319	    case TK_TUPLE:
   320	    {
   321	      ast_t* pattern_child = ast_child(pattern);
   322
   323	      // Treat a one element tuple as a normal expression.
   324	      if(ast_sibling(pattern_child) == NULL)
   325	        return make_pattern_type(opt, pattern_child);
   326
   327	      // Check every element pairwise.
   328	      ast_t* tuple_type = ast_from(pattern, TK_TUPLETYPE);
   329	      bool ok = true;
   330
   331	      while(pattern_child != NULL)
   332	      {
   333	        ast_t* child_type = make_pattern_type(opt, pattern_child);
   334
   335	        if(child_type != NULL)
   336	          ast_append(tuple_type, child_type);
   337	        else
   338	          ok = false;
   339
   340	        pattern_child = ast_sibling(pattern_child);
   341	      }
   342
   343	      if(!ok)
   344	      {
   345	        ast_free_unattached(tuple_type);
   346	        tuple_type = NULL;
   347	      }
   348
   349	      return tuple_type;
   350	    }
   351
   352	    case TK_SEQ:
   353	    {
   354	      // This may be just a capture.
   355	      if(ast_childcount(pattern) == 1)
   356	        return make_pattern_type(opt, ast_child(pattern));
   357
   358	      // Treat this like other nodes.
   359	      break;
   360	    }
   361
   362	    default:
   363	      break;
   364	  }
   365
   366	  // Structural equality, pattern.eq(match).
   367	  deferred_reification_t* fun = lookup(opt, pattern, pattern_type,
   368	    stringtab("eq"));
   369
   370	  if(fun == NULL)
   371	  {
   372	    ast_error(opt->check.errors, pattern,
   373	      "this pattern element doesn't support structural equality");
   374
   375	    return NULL;
   376	  }
   377
   378	  if(ast_id(fun->ast) != TK_FUN)
   379	  {
   380	    ast_error(opt->check.errors, pattern,
   381	      "eq is not a function on this pattern element");
   382	    ast_error_continue(opt->check.errors, fun->ast,
   383	      "definition of eq is here");
   384	    deferred_reify_free(fun);
   385	    return NULL;
   386	  }
   387
   388	  ast_t* r_fun = deferred_reify_method_def(fun, fun->ast, opt);
   389
   390	  AST_GET_CHILDREN(r_fun, cap, id, typeparams, params, result, partial);
   391	  bool ok = true;
   392
   393	  if(ast_id(typeparams) != TK_NONE)
   394	  {
   395	    ast_error(opt->check.errors, pattern,
   396	      "polymorphic eq not supported in pattern matching");
   397	    ok = false;
   398	  }
   399
   400	  if(!is_bool(result))
   401	  {
   402	    ast_error(opt->check.errors, pattern,
   403	      "eq must return Bool when pattern matching");
   404	    ok = false;
   405	  }
   406
   407	  if(ast_id(partial) != TK_NONE)
   408	  {
   409	    ast_error(opt->check.errors, pattern,
   410	      "eq cannot be partial when pattern matching");
   411	    ok = false;
   412	  }
   413
   414	  ast_t* r_type = set_cap_and_ephemeral(pattern_type, ast_id(cap), TK_EPHEMERAL);
   415	  errorframe_t info = NULL;
   416
   417	  if(!is_subtype(pattern_type, r_type, &info, opt))
   418	  {
   419	    errorframe_t frame = NULL;
   420	    ast_error_frame(&frame, pattern, "eq cannot be called on this pattern");
   421	    errorframe_append(&frame, &info);
   422	    errorframe_report(&frame, opt->check.errors);
   423	    ok = false;
   424	  }
   425
   426	  ast_t* param = ast_child(params);
   427
   428	  if(param == NULL || ast_sibling(param) != NULL)
   429	  {
   430	    ast_error(opt->check.errors, pattern,
   431	      "eq must take a single argument when pattern matching");
   432
   433	    ok = false;
   434	  }
   435
   436	  if(ok)
   437	  {
   438	    AST_GET_CHILDREN(param, param_id, param_type);
   439	    pattern_type = ast_dup(param_type);
   440	  } else {
   441	    pattern_type = NULL;
   442	  }
   443
   444	  ast_free_unattached(r_type);
   445	  ast_free_unattached(r_fun);
   446	  deferred_reify_free(fun);
   447
   448	  return pattern_type;
   449	}
   450
   451	// Infer the types of any literals in the pattern of the given case
   452	static bool infer_pattern_type(ast_t* pattern, ast_t* match_expr_type,
   453	  pass_opt_t* opt)
   454	{
   455	  pony_assert(pattern != NULL);
   456	  pony_assert(match_expr_type != NULL);
   457
   458	  if(is_type_literal(match_expr_type))
   459	  {
   460	    ast_error(opt->check.errors, match_expr_type,
   461	      "cannot infer type for literal match expression");
   462	    return false;
   463	  }
   464
   465	  return coerce_literals(&pattern, match_expr_type, opt);
   466	}
   467
   468	bool expr_case(pass_opt_t* opt, ast_t* ast)
   469	{
   470	  pony_assert(opt != NULL);
   471	  pony_assert(ast_id(ast) == TK_CASE);
   472	  AST_GET_CHILDREN(ast, pattern, guard, body);
   473
   474	  if((ast_id(pattern) == TK_NONE) && (ast_id(guard) == TK_NONE))
   475	  {
   476	    ast_error(opt->check.errors, ast,
   477	      "can't have a case with no conditions, use an else clause");
   478	    return false;
   479	  }
   480
   481	  if((ast_id(pattern) == TK_DONTCAREREF))
   482	  {
   483	    ast_error(opt->check.errors, pattern,
   484	      "can't have a case with `_` only, use an else clause");
   485	    return false;
   486	  }
   487
   488	  ast_t* cases = ast_parent(ast);
   489	  ast_t* match = ast_parent(cases);
   490	  ast_t* match_expr = ast_child(match);
   491	  ast_t* match_type = ast_type(match_expr);
   492
   493	  if(ast_checkflag(match_expr, AST_FLAG_JUMPS_AWAY) ||
   494	    is_typecheck_error(match_type))
   495	    return false;
   496
   497	  if(!infer_pattern_type(pattern, match_type, opt))
   498	    return false;
   499
   500	  ast_t* pattern_type = make_pattern_type(opt, pattern);
   501
   502	  if(pattern_type == NULL)
   503	    return false;
   504
   505	  ast_settype(ast, pattern_type);
   506
   507	  bool ok = true;
   508	  errorframe_t info = NULL;
   509
   510	  switch(is_matchtype(match_type, pattern_type, &info, opt))
   511	  {
   512	    case MATCHTYPE_ACCEPT:
   513	      break;
   514
   515	    case MATCHTYPE_REJECT:
   516	    {
   517	      errorframe_t frame = NULL;
   518	      ast_error_frame(&frame, pattern, "this pattern can never match");
   519	      ast_error_frame(&frame, match_type, "match type: %s",
   520	        ast_print_type(match_type));
   521	      // TODO report unaliased type when body is consume !
   522	      ast_error_frame(&frame, pattern, "pattern type: %s",
   523	        ast_print_type(pattern_type));
   524	      errorframe_append(&frame, &info);
   525	      errorframe_report(&frame, opt->check.errors);
   526
   527	      ok = false;
   528	      break;
   529	    }
   530
   531	    case MATCHTYPE_DENY_CAP:
   532	    {
   533	      errorframe_t frame = NULL;
   534	      ast_error_frame(&frame, pattern,
   535	        "this capture violates capabilities, because the match would "
   536	        "need to differentiate by capability at runtime instead of matching "
   537	        "on type alone");
   538	      ast_error_frame(&frame, match_type, "the match type allows for more than "
   539	        "one possibility with the same type as pattern type, but different "
   540	        "capabilities. match type: %s",
   541	        ast_print_type(match_type));
   542	      ast_error_frame(&frame, pattern, "pattern type: %s",
   543	        ast_print_type(pattern_type));
   544	      errorframe_append(&frame, &info);
   545	      errorframe_report(&frame, opt->check.errors);
   546
   547	      ok = false;
   548	      break;
   549	    }
   550
   551	    case MATCHTYPE_DENY_NODESC:
   552	    {
   553	      errorframe_t frame = NULL;
   554	      ast_error_frame(&frame, pattern,
   555	        "this capture cannot match, since the type %s "
   556	        "is a struct and lacks a type descriptor",
   557	        ast_print_type(pattern_type));
   558	      ast_error_frame(&frame, match_type,
   559	        "a struct cannot be part of a union type. match type: %s",
   560	        ast_print_type(match_type));
   561	      ast_error_frame(&frame, pattern, "pattern type: %s",
   562	        ast_print_type(pattern_type));
   563	      errorframe_append(&frame, &info);
   564	      errorframe_report(&frame, opt->check.errors);
   565	      ok = false;
   566	      break;
   567	    }
   568	  }
   569
   570	  if(ast_id(guard) != TK_NONE)
   571	  {
   572	    ast_t* guard_type = ast_type(guard);
   573
   574	    if(is_typecheck_error(guard_type))
   575	    {
   576	      ok = false;
   577	    } else if(!is_bool(guard_type)) {
   578	      ast_error(opt->check.errors, guard,
   579	        "guard must be a boolean expression");
   580	    }
   581	  }
   582	  return ok<response clipped><NOTE>Due to the max output limit, only part of this file has been shown to you. You should retry this tool after you have searched inside the file with `grep -n` in order to find the line numbers of what you are looking for.</NOTE>

Running command: grep -n "iso" /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

The `match.c` file is quite large and complex, handling various aspects of `match` expressions in the Pony language. To address the issue described, we need to focus on how `iso` is handled within `match` expressions.

Let's search for the specific parts of the code that deal with `iso` and `match` to understand where the incorrect aliasing might be occurring.

grep -n "iso" /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

Command `grep -n "iso" /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c` executed with exit code 1.

Running command: grep -n "alias" /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

It seems that the string "iso" is not directly present in `match.c`. Let's try to search for other relevant keywords or functions that might be related to handling `iso` or aliasing in `match` expressions.

grep -n "alias" /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

It seems that the string "iso" is not directly present in `match.c`. Let's try to search for other relevant keywords or functions that might be related to handling `iso` or aliasing in `match` expressions.

Command `grep -n "alias" /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c` executed with exit code 0.

6:#include "../type/alias.h"
521:      // TODO report unaliased type when body is consume !

The presence of `../type/alias.h` in the includes and a TODO comment regarding reporting unaliased type when the body is consumed suggests that aliasing is indeed relevant to the code in `match.c`. The TODO comment indicates a potential area of interest for our issue.

Let's examine the `make_pattern_type` function, which is responsible for determining the type of a pattern in a `match` expression. This function might be relevant to understanding how `iso` is handled.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c:
   282	static ast_t* make_pattern_type(pass_opt_t* opt, ast_t* pattern)
   283	{
   284	  if(ast_id(pattern) == TK_NONE)
   285	  {
   286	    ast_t* type = ast_from(pattern, TK_DONTCARETYPE);
   287	    ast_settype(pattern, type);
   288	    return type;
   289	  }
   290
   291	  if(ast_checkflag(pattern, AST_FLAG_JUMPS_AWAY))
   292	  {
   293	    ast_error(opt->check.errors, pattern,
   294	      "not a matchable pattern - the expression jumps away with no value");
   295	    return NULL;
   296	  }
   297
   298	  ast_t* pattern_type = ast_type(pattern);
   299
   300	  if(is_typecheck_error(pattern_type))
   301	    return NULL;
   302
   303	  if(is_bare(pattern_type))
   304	  {
   305	    ast_error(opt->check.errors, pattern,
   306	      "a match pattern cannot have a bare type");
   307	    ast_error_continue(opt->check.errors, pattern_type,
   308	      "type is %s", ast_print_type(pattern_type));
   309	    return NULL;
   310	  }
   311
   312	  switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;
   318
   319	    case TK_TUPLE:
   320	    {
   321	      ast_t* pattern_child = ast_child(pattern);
   322
   323	      // Treat a one element tuple as a normal expression.
   324	      if(ast_sibling(pattern_child) == NULL)
   325	        return make_pattern_type(opt, pattern_child);
   326
   327	      // Check every element pairwise.
   328	      ast_t* tuple_type = ast_from(pattern, TK_TUPLETYPE);
   329	      bool ok = true;
   330
   331	      while(pattern_child != NULL)
   332	      {
   333	        ast_t* child_type = make_pattern_type(opt, pattern_child);
   334
   335	        if(child_type != NULL)
   336	          ast_append(tuple_type, child_type);
   337	        else
   338	          ok = false;
   339
   340	        pattern_child = ast_sibling(pattern_child);
   341	      }
   342
   343	      if(!ok)
   344	      {
   345	        ast_free_unattached(tuple_type);
   346	        tuple_type = NULL;
   347	      }
   348
   349	      return tuple_type;
   350	    }
   351
   352	    case TK_SEQ:
   353	    {
   354	      // This may be just a capture.
   355	      if(ast_childcount(pattern) == 1)
   356	        return make_pattern_type(opt, ast_child(pattern));
   357
   358	      // Treat this like other nodes.
   359	      break;
   360	    }
   361
   362	    default:
   363	      break;
   364	  }
   365
   366	  // Structural equality, pattern.eq(match).
   367	  deferred_reification_t* fun = lookup(opt, pattern, pattern_type,
   368	    stringtab("eq"));
   369
   370	  if(fun == NULL)
   371	  {
   372	    ast_error(opt->check.errors, pattern,
   373	      "this pattern element doesn't support structural equality");
   374
   375	    return NULL;
   376	  }
   377
   378	  if(ast_id(fun->ast) != TK_FUN)
   379	  {
   380	    ast_error(opt->check.errors, pattern,
   381	      "eq is not a function on this pattern element");
   382	    ast_error_continue(opt->check.errors, fun->ast,
   383	      "definition of eq is here");
   384	    deferred_reify_free(fun);
   385	    return NULL;
   386	  }
   387
   388	  ast_t* r_fun = deferred_reify_method_def(fun, fun->ast, opt);
   389
   390	  AST_GET_CHILDREN(r_fun, cap, id, typeparams, params, result, partial);
   391	  bool ok = true;
   392
   393	  if(ast_id(typeparams) != TK_NONE)
   394	  {
   395	    ast_error(opt->check.errors, pattern,
   396	      "polymorphic eq not supported in pattern matching");
   397	    ok = false;
   398	  }
   399
   400	  if(!is_bool(result))
   401	  {
   402	    ast_error(opt->check.errors, pattern,
   403	      "eq must return Bool when pattern matching");
   404	    ok = false;
   405	  }
   406
   407	  if(ast_id(partial) != TK_NONE)
   408	  {
   409	    ast_error(opt->check.errors, pattern,
   410	      "eq cannot be partial when pattern matching");
   411	    ok = false;
   412	  }
   413
   414	  ast_t* r_type = set_cap_and_ephemeral(pattern_type, ast_id(cap), TK_EPHEMERAL);
   415	  errorframe_t info = NULL;
   416
   417	  if(!is_subtype(pattern_type, r_type, &info, opt))
   418	  {
   419	    errorframe_t frame = NULL;
   420	    ast_error_frame(&frame, pattern, "eq cannot be called on this pattern");
   421	    errorframe_append(&frame, &info);
   422	    errorframe_report(&frame, opt->check.errors);
   423	    ok = false;
   424	  }
   425
   426	  ast_t* param = ast_child(params);
   427
   428	  if(param == NULL || ast_sibling(param) != NULL)
   429	  {
   430	    ast_error(opt->check.errors, pattern,
   431	      "eq must take a single argument when pattern matching");
   432
   433	    ok = false;
   434	  }
   435
   436	  if(ok)
   437	  {
   438	    AST_GET_CHILDREN(param, param_id, param_type);
   439	    pattern_type = ast_dup(param_type);
   440	  } else {
   441	    pattern_type = NULL;
   442	  }
   443
   444	  ast_free_unattached(r_type);
   445	  ast_free_unattached(r_fun);
   446	  deferred_reify_free(fun);
   447
   448	  return pattern_type;
   449	}

I am thinking...: The `make_pattern_type` function is crucial in determining the type of a pattern in a `match` expression. It handles various pattern types, including `TK_MATCH_CAPTURE`, which is relevant to our issue.

To fix the incorrect aliasing of `iso` when using `match`, we need to ensure that the compiler correctly handles the aliasing of `iso` references in `match` patterns.

Let's think about the necessary changes to resolve the issue.
To fix the incorrect aliasing of `iso` when using `match`, we need to modify the `make_pattern_type` function to correctly handle `iso` references. Specifically, we should ensure that the type of the pattern is correctly determined when the pattern is a capture (`TK_MATCH_CAPTURE`). We need to check if the captured type is `iso` and handle it accordingly to prevent incorrect aliasing.

think

Your thought has been logged.

Your thought has been logged.

To implement the necessary changes, we need to modify the `match.c` file to correctly handle `iso` references in `match` patterns.

Let's start by examining the handling of `TK_MATCH_CAPTURE` in the `make_pattern_type` function.

case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      // For iso patterns, we need to consume the value
   318	      if (ast_id(pattern_type) == TK_ISO)
   319	      {
   320	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   321	      }
   322	      return pattern_type;

To implement the necessary changes, we need to modify the `match.c` file to correctly handle `iso` references in `match` patterns.

Let's start by examining the handling of `TK_MATCH_CAPTURE` in the `make_pattern_type` function.

I edited the file /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c.

ERROR:
No replacement was performed, old_str `case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;` did not appear verbatim in /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c.

case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

It seems that the exact lines I provided are not present in the `match.c` file. Let's try to modify the code around the `TK_MATCH_CAPTURE` case to correctly handle `iso` references.

First, we need to find the correct location of the `TK_MATCH_CAPTURE` case in the `make_pattern_type` function.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c:
   312	  switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

The `TK_MATCH_CAPTURE` case is indeed present at line 315. To fix the incorrect aliasing of `iso` when using `match`, we need to modify the code to correctly handle `iso` references.

Let's modify the code around the `TK_MATCH_CAPTURE` case.

case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      if(ast_id(pattern_type) == TK_ISO)
   318	      {
   319	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   320	      }
   321	      return pattern_type;

The `TK_MATCH_CAPTURE` case is indeed present at line 315. To fix the incorrect aliasing of `iso` when using `match`, we need to modify the code to correctly handle `iso` references.

Let's modify the code around the `TK_MATCH_CAPTURE` case.

case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      if(ast_id(pattern_type) == TK_ISO)
   318	      {
   319	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   320	      }
   321	      return pattern_type;

It seems that the exact lines I provided are still not present in the `match.c` file. Let's try to insert the necessary code after the `TK_MATCH_CAPTURE` case.

if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}

It seems that the exact lines I provided are still not present in the `match.c` file. Let's try to insert the necessary code after the `TK_MATCH_CAPTURE` case.

The file /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c has been edited. Here's the result of running `cat -n` on a snippet of the edited file:
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;
   318	if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}
   319
   320	    case TK_TUPLE:
   321	    {
   322	      ast_t* pattern_child = ast_child(pattern);
   323
Review the changes and make sure they are as expected (correct indentation, no duplicate lines, etc). Edit the file again if necessary.

if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}

--- /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
+++ /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
@@ -317,0 +318 @@
+if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}

The inserted line is not correctly placed. It should be before the `return` statement at line 317. Let's correct this by editing the file again.

315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      if(ast_id(pattern_type) == TK_ISO)
   318	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   319	      return pattern_type;

The inserted line is not correctly placed. It should be before the `return` statement at line 317. Let's correct this by editing the file again.

ERROR:
No replacement was performed, old_str `315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;` did not appear verbatim in /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c.

315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      if(ast_id(pattern_type) == TK_ISO)
   318	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   319	      return pattern_type;

Let's try to make the replacement more flexible by matching a smaller snippet of code.

if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}return pattern_type;

Let's try to make the replacement more flexible by matching a smaller snippet of code.

ERROR:
No replacement was performed. Multiple occurrences of old_str `return pattern_type;` in lines [317, 449]. Please ensure it is unique.

if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}return pattern_type;

The `return pattern_type;` statement appears multiple times in the file. Let's try to make the replacement more specific by including more context.

case TK_MATCH_DONTCARE:
	      return pattern_type;

case TK_MATCH_DONTCARE:
	      if(ast_id(pattern_type) == TK_ISO)
	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
	      return pattern_type;

The `return pattern_type;` statement appears multiple times in the file. Let's try to make the replacement more specific by including more context.

ERROR:
No replacement was performed, old_str `case TK_MATCH_DONTCARE:
	      return pattern_type;` did not appear verbatim in /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c.

case TK_MATCH_DONTCARE:
	      return pattern_type;

case TK_MATCH_DONTCARE:
	      if(ast_id(pattern_type) == TK_ISO)
	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
	      return pattern_type;

Let's try to view the surrounding code again to understand the context and make the necessary changes.

Let's try to view the surrounding code again to understand the context and make the necessary changes.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c:
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

Let's try to make the replacement by matching the entire switch case block.

switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      if(ast_id(pattern_type) == TK_ISO)
   318	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   319	      return pattern_type;

Let's try to make the replacement by matching the entire switch case block.

ERROR:
No replacement was performed, old_str `switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;` did not appear verbatim in /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c.

switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

switch(ast_id(pattern))
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      if(ast_id(pattern_type) == TK_ISO)
   318	        pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   319	      return pattern_type;

It seems that making a replacement with a large block of code is not working as expected. Let's try a different approach by directly editing the file to insert the necessary condition before the `return` statement.

if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL); return pattern_type;

It seems that making a replacement with a large block of code is not working as expected. Let's try a different approach by directly editing the file to insert the necessary condition before the `return` statement.

if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL); return pattern_type;

To avoid the multiple occurrences issue, let's directly insert the necessary code at the specific line number.

if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);

To avoid the multiple occurrences issue, let's directly insert the necessary code at the specific line number.

The file /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c has been edited. Here's the result of running `cat -n` on a snippet of the edited file:
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;
   318	if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   319	if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}
   320
   321	    case TK_TUPLE:
   322	    {
   323
Review the changes and make sure they are as expected (correct indentation, no duplicate lines, etc). Edit the file again if necessary.

if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);

--- /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
+++ /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
@@ -317,0 +318 @@
+if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);

The inserted line is not correctly placed and is duplicated. Let's correct this by editing the file again to remove the duplicate line and place the condition before the `return` statement.

if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}

The inserted line is not correctly placed and is duplicated. Let's correct this by editing the file again to remove the duplicate line and place the condition before the `return` statement.

The file /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c has been edited. Here's the result of running `cat -n` on a snippet of /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;
   318
   319
   320	    case TK_TUPLE:
   321	    {
   322	      ast_t* pattern_child = ast_child(pattern);
   323
Review the changes and make sure they are as expected. Edit the file again if necessary.

if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}

--- /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
+++ /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
@@ -318,2 +318 @@
-if(ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
-if(ast_id(pattern_type) == TK_ISO){pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);}
+

The duplicate lines have been removed, but the condition is still not correctly placed. Let's edit the file again to insert the condition before the `return` statement.

The duplicate lines have been removed, but the condition is still not correctly placed. Let's edit the file again to insert the condition before the `return` statement.

Let's try a different approach. We can directly edit the line 317 to include the condition.

Let's try a different approach. We can directly edit the line 317 to include the condition.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      return pattern_type;

Now, let's edit line 317 directly.

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL); return pattern_type;

Now, let's edit line 317 directly.

ERROR:
Parameter `old_str` is required for command: str_replace.

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL); return pattern_type;

To edit line 317 directly, we need to provide the `old_str` parameter.

To edit line 317 directly, we need to provide the `old_str` parameter.

ERROR:
No replacement was performed. Multiple occurrences of old_str `return pattern_type;` in lines [317, 449]. Please ensure it is unique.

Parameter 'command' is expected to be one of ['view', 'create', 'str_replace', 'insert', 'undo_edit'].

Parameter 'command' is expected to be one of ['view', 'create', 'str_replace', 'insert', 'undo_edit'].

It seems that we are unable to make the replacement due to the multiple occurrences of `return pattern_type;`. Let's try to directly edit the file using a different method.

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);

It seems that we are unable to make the replacement due to the multiple occurrences of `return pattern_type;`. Let's try to directly edit the file using a different method.

The file /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c has been edited. Here's the result of running `cat -n` on a snippet of the edited file:
   313	  {
   314	    case TK_DONTCAREREF:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   318	      return pattern_type;
   319
   320
   321	    case TK_TUPLE:
   322
Review the changes and make sure they are as expected (correct indentation, no duplicate lines, etc). Edit the file again if necessary.

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);

--- /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
+++ /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c
@@ -316,0 +317 @@
+if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);

The inserted line is not correctly indented. Let's edit the file again to correct the indentation.

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   318	      return pattern_type;

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
	      return pattern_type;

The inserted line is not correctly indented. Let's edit the file again to correct the indentation.

ERROR:
No replacement was performed, old_str `if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   318	      return pattern_type;` did not appear verbatim in /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c.

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   318	      return pattern_type;

if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
	      return pattern_type;

Let's try to make the replacement more flexible.

if (ast_id(pattern_type) == TK_ISO) pattern_type

if (ast_id(pattern_type) == TK_ISO) pattern_type

Let's try to make the replacement more flexible.

ERROR:
Invalid `new_str` parameter: if (ast_id(pattern_type) == TK_ISO) pattern_type. No replacement was performed. `new_str` and `old_str` must be different.

if (ast_id(pattern_type) == TK_ISO) pattern_type

if (ast_id(pattern_type) == TK_ISO) pattern_type

Running command: sed -i '317s/^/	      /' /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

It seems that we are unable to make the replacement using the `str_replace` command. Let's try to directly edit the file using a text editor or other means to correct the indentation.

sed -i '317s/^/	      /' /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

It seems that we are unable to make the replacement using the `str_replace` command. Let's try to directly edit the file using a text editor or other means to correct the indentation.

Command `sed -i '317s/^/	      /' /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c` executed with exit code 0.

sed -i '317s/^/      /' /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c

The indentation has been corrected. Let's verify the changes.

The indentation has been corrected. Let's verify the changes.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/src/libponyc/expr/match.c:
   315	    case TK_MATCH_CAPTURE:
   316	    case TK_MATCH_DONTCARE:
   317	      if (ast_id(pattern_type) == TK_ISO) pattern_type = set_cap_and_ephemeral(pattern_type, TK_TRN, TK_EPHEMERAL);
   318	      return pattern_type;

Running command: cd /workspace/ponylang__ponyc__0.1 && make

The changes look good. The condition to handle `iso` references has been correctly added and indented.

Next, we should verify that the changes fix the issue described in the problem statement. To do this, we need to recompile the Pony compiler and test it.

Let's first recompile the Pony compiler.

cd /workspace/ponylang__ponyc__0.1 && make

Command `cd /workspace/ponylang__ponyc__0.1 && make` executed with exit code 2.

/bin/sh: 1: cd: can't cd to /workspace/ponylang__ponyc__0.1/build/build_release
make: *** [Makefile:192: build] Error 2

[The command completed with exit code 2.]

Running command: cd /workspace/ponylang__ponyc__0.1 && make clean && make

It seems that the compilation failed. Let's try to understand the error message and correct it.

The error message indicates that there's an issue with changing into the `/workspace/ponylang__ponyc__0.1/build/build_release` directory.

Let's check if the `build` directory exists and try to clean it before recompiling.

cd /workspace/ponylang__ponyc__0.1 && make clean && make

Command `cd /workspace/ponylang__ponyc__0.1 && make clean && make` executed with exit code 2.

Running command: rm -rf /workspace/ponylang__ponyc__0.1/build && cd /workspace/ponylang__ponyc__0.1 && make

It seems that the `make clean` command didn't resolve the issue. Let's try to manually remove the `build` directory and then recompile.

rm -rf /workspace/ponylang__ponyc__0.1/build && cd /workspace/ponylang__ponyc__0.1 && make

It seems that the `make clean` command didn't resolve the issue. Let's try to manually remove the `build` directory and then recompile.

Command `rm -rf /workspace/ponylang__ponyc__0.1/build && cd /workspace/ponylang__ponyc__0.1 && make` executed with exit code 2.

Reading file: /workspace/ponylang__ponyc__0.1/Makefile

It appears that the issue persists even after removing the `build` directory. Let's try to investigate the `Makefile` to understand the cause of the error.

It appears that the issue persists even after removing the `build` directory. Let's try to investigate the `Makefile` to understand the cause of the error.

I read the file /workspace/ponylang__ponyc__0.1/Makefile.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/Makefile:
   190
   191	build:
   192		$(SILENT)cd '$(buildDir)' && env CC="$(CC)" CXX="$(CXX)" cmake --build '$(buildDir)' --config $(config) --target all -- $(build_flags)
   193
   194	ponyc:
   195		$(SILENT)cd '$(buildDir)' && env CC="$(CC)" CXX="$(CXX)" cmake --build '$(buildDir)' --config $(config) --target ponyc -- $(build_flags)

The error message indicates that there's an issue with the `cd` command in the `Makefile`, specifically on line 192. It seems that the `buildDir` variable is not correctly set.

Let's check the value of `buildDir` by examining the `Makefile` further.

The error message indicates that there's an issue with the `cd` command in the `Makefile`, specifically on line 192. It seems that the `buildDir` variable is not correctly set.

Let's check the value of `buildDir` by examining the `Makefile` further.

Here's the result of running `cat -n` on /workspace/ponylang__ponyc__0.1/Makefile:
     1	config ?= release
     2	arch ?= native
     3	tune ?= generic
     4	build_flags ?= -j2
     5	llvm_archs ?= X86;ARM;AArch64;WebAssembly;RISCV
     6	llvm_config ?= Release
     7	llc_arch ?= x86-64
     8	pic_flag ?=
     9
    10	ifndef version
    11	  version := $(shell cat VERSION)
    12	  ifneq ($(wildcard .git),)
    13	    sha := $(shell git rev-parse --short HEAD)
    14	    tag := $(version)-$(sha)
    15	  else
    16	    tag := $(version)
    17	  endif
    18	else
    19	  tag := $(version)
    20	endif
    21
    22	symlink := yes
    23	ifdef DESTDIR
    24	  prefix := $(DESTDIR)
    25	  ponydir := $(prefix)
    26	  symlink := no
    27	else
    28	  prefix ?= /usr/local
    29	  ponydir ?= $(prefix)/lib/pony/$(tag)
    30	endif
    31
    32	# Use clang by default; because CC defaults to 'cc'
    33	# you must explicitly set CC=gcc to use gcc
    34	ifndef CC
    35	  ifneq (,$(shell clang --version 2>&1 | grep 'clang version'))
    36	    CC = clang
    37	    CXX = clang++
    38	  endif
    39	else ifeq ($(CC), cc)
    40	  ifneq (,$(shell clang --version 2>&1 | grep 'clang version'))
    41	    CC = clang
    42	    CXX = clang++
    43	  endif
    44	endif
    45
    46	# By default, CC is cc and CXX is g++
    47	# So if you use standard alternatives on many Linuxes
    48	# You can get clang and g++ and then bad things will happen
    49	ifneq (,$(shell $(CC) --version 2>&1 | grep 'clang version'))
    50	  ifneq (,$(shell $(CXX) --version 2>&1 | grep "Free Software Foundation"))

Running command: grep -n "buildDir" /workspace/ponylang__ponyc__0.1/Makefile

The `buildDir` variable is not defined in the visible part of the `Makefile`. Let's search for `buildDir` in the entire `Makefile` to understand where it's defined.

grep -n "buildDir" /workspace/ponylang__ponyc__0.1/Makefile

The `buildDir` variable is not defined in the visible part of the `Makefile`. Let's search for `buildDir` in the entire `Makefile` to understand where it's defined.

Command `grep -n "buildDir" /workspace/ponylang__ponyc__0.1/Makefile` executed with exit code 0.

78:buildDir := $(srcDir)/build/build_$(config)
81:outDir := $(subst /libponyrt.tests,,$(shell grep -o -s '$(srcDir)\/build\/$(config).*\/libponyrt.tests' $(buildDir)/cmake_install.cmake))
186:    $(SILENT)mkdir -p '$(buildDir)'
187:    $(SILENT)cd '$(buildDir)' && env CC="$(CC)" CXX="$(CXX)" cmake -B '$(buildDir)' -S '$(srcDir)' -DCMAKE_BUILD_TYPE=$(config) -DPONY_ARCH=$(arch) -DPONY_PIC_FLAG=$(pic_flag) -DPONYC_VERSION=$(tag) -DCMAKE_C_FLAGS="-march=$(arch) -mtune=$(tune)" -DCMAKE_CXX_FLAGS="-march=$(arch) -mtune=$(tune)" $(BITCODE_FLAGS) $(LTO_CONFIG_FLAGS) $(CMAKE_FLAGS) $(PONY_USES)
192:    $(SILENT)cd '$(buildDir)' && env CC="$(CC)" CXX="$(CXX)" cmake --build '$(buildDir)' --config $(config) --target all -- $(build_flags)
195:    $(SILENT)cd '$(buildDir)' && env CC="$(CC)" CXX="$(CXX)" cmake --build '$(buildDir)' --config $(config) --target ponyc -- $(build_flags)
233:    $(SILENT)cd '$(outDir)' && $(buildDir)/test/full-program-runner/full-program-runner --debugger='$(debuggercmd)' --timeout_s=120 --max_parallel=$(num_cores) --ponyc=$(outDir)/ponyc --output=$(outDir)/full-program-tests/release --test_lib=$(outDir)/test_lib $(srcDir)/test/full-program-tests
237:    $(SILENT)cd '$(outDir)' && $(buildDir)/test/full-program-runner/full-program-runner --debugger='$(debuggercmd)' --timeout_s=120 --max_parallel=$(num_cores) --ponyc=$(outDir)/ponyc --debug --output=$(outDir)/full-program-tests/debug --test_lib=$(outDir)/test_lib $(srcDir)/test/full-program-tests
276:    $(SILENT)([ -d '$(buildDir)' ] && cd '$(buildDir)' && cmake --build '$(buildDir)' --config $(config) --target clean) || true
278:    $(SILENT)rm -rf $(buildDir)
288:    $(SILENT)cp $(buildDir)/src/libponyrt/libponyrt.a $(ponydir)/lib/$(arch)

Running command: grep -n "srcDir" /workspace/ponylang__ponyc__0.1/Makefile

The `buildDir` variable is defined on line 78 as `$(srcDir)/build/build_$(config)`. Let's check where `srcDir` is defined.

grep -n "srcDir" /workspace/ponylang__ponyc__0.1/Makefile

The `buildDir` variable is defined on line 78 as `$(srcDir)/build/build_$(config)`. Let's check where `srcDir` is defined.

Command `grep -n "srcDir" /workspace/ponylang__ponyc__0.1/Makefile` executed with exit code 0.

77:srcDir := $(shell dirname '$(subst /Volumes/Macintosh HD/,/,$(realpath $(lastword $(MAKEFILE_LIST))))')
78:buildDir := $(srcDir)/build/build_$(config)
81:outDir := $(subst /libponyrt.tests,,$(shell grep -o -s '$(srcDir)\/build\/$(config).*\/libponyrt.tests' $(buildDir)/cmake_install.cmake))
83:  outDir := $(srcDir)/build/$(config)
86:libsSrcDir := $(srcDir)/lib
87:libsBuildDir := $(srcDir)/build/build_libs
88:libsOutDir := $(srcDir)/build/libs
187:    $(SILENT)cd '$(buildDir)' && env CC="$(CC)" CXX="$(CXX)" cmake -B '$(buildDir)' -S '$(srcDir)' -DCMAKE_BUILD_TYPE=$(config) -DPONY_ARCH=$(arch) -DPONY_PIC_FLAG=$(pic_flag) -DPONYC_VERSION=$(tag) -DCMAKE_C_FLAGS="-march=$(arch) -mtune=$(tune)" -DCMAKE_CXX_FLAGS="-march=$(arch) -mtune=$(tune)" $(BITCODE_FLAGS) $(LTO_CONFIG_FLAGS) $(CMAKE_FLAGS) $(PONY_USES)
197:crossBuildDir := $(srcDir)/build/$(arch)/build_$(config)
201:    $(SILENT)cd '$(crossBuildDir)' && env CC=$(CC) CXX=$(CXX) cmake -B '$(crossBuildDir)' -S '$(srcDir)' -DCMAKE_CROSSCOMPILING=true -DCMAKE_SYSTEM_NAME=Linux -DCMAKE_SYSTEM_PROCESSOR=$(arch) -DCMAKE_C_COMPILER=$(CC) -DCMAKE_CXX_COMPILER=$(CXX) -DPONY_CROSS_LIBPONYRT=true -DCMAKE_BUILD_TYPE=$(config) -DCMAKE_C_FLAGS="$(cross_cflags)" -DCMAKE_CXX_FLAGS="$(cross_cflags)" -DPONY_ARCH=$(arch) -DPONYC_VERSION=$(version) -DLL_FLAGS="$(cross_llc_flags)"  $(CMAKE_FLAGS)
233:    $(SILENT)cd '$(outDir)' && $(buildDir)/test/full-program-runner/full-program-runner --debugger='$(debuggercmd)' --timeout_s=120 --max_parallel=$(num_cores) --ponyc=$(outDir)/ponyc --output=$(outDir)/full-program-tests/release --test_lib=$(outDir)/test_lib $(srcDir)/test/full-program-tests
237:    $(SILENT)cd '$(outDir)' && $(buildDir)/test/full-program-runner/full-program-runner --debugger='$(debuggercmd)' --timeout_s=120 --max_parallel=$(num_cores) --ponyc=$(outDir)/ponyc --debug --output=$(outDir)/full-program-tests/debug --test_lib=$(outDir)/test_lib $(srcDir)/test/full-program-tests

Running command: make -n build

The `srcDir` variable is defined on line 77. It seems that the issue might be related to how the `srcDir` is being determined.

Let's try to print the value of `srcDir` and `buildDir` to understand their values.

The `srcDir` variable is defined on line 77. It seems that the issue might be related to how the `srcDir` is being determined.

Let's try to print the value of `srcDir` and `buildDir` to understand their values.

Command `make -n build` executed with exit code 0.

cd '/workspace/ponylang__ponyc__0.1/build/build_release' && env CC="clang" CXX="clang++" cmake --build '/workspace/ponylang__ponyc__0.1/build/build_release' --config release --target all -- -j2

Running command: mkdir -p /workspace/ponylang__ponyc__0.1/build/build_release

The output of `make -n build` shows that the `buildDir` is correctly set to `/workspace/ponylang__ponyc__0.1/build/build_release`. This suggests that the issue might not be with the `buildDir` itself, but rather with the fact that the `build` directory doesn't exist or can't be accessed for some reason.

Let's try to manually create the `build` directory and see if that resolves the issue.

Command `mkdir -p /workspace/ponylang__ponyc__0.1/build/build_release` executed with exit code 0.

The `build` directory has been created. Now, let's try to recompile the Pony compiler again.

The `build` directory has been created. Now, let's try to recompile the Pony compiler again.

Error: could not load cache
make: *** [Makefile:192: build] Error 1

Running command: rm -rf /workspace/ponylang__ponyc__0.1/build && mkdir -p /workspace/ponylang__ponyc__0.1/build/build_release && cd /workspace/ponylang__ponyc__0.1 && make

It seems that there's still an issue with the compilation process. The error message "could not load cache" suggests that there might be a problem with the CMake cache.

Let's try to clean the `build` directory again and then recompile.

rm -rf /workspace/ponylang__ponyc__0.1/build && mkdir -p /workspace/ponylang__ponyc__0.1/build/build_release && cd /workspace/ponylang__ponyc__0.1 && make

It seems that there's still an issue with the compilation process. The error message "could not load cache" suggests that there might be a problem with the CMake cache.

Let's try to clean the `build` directory again and then recompile.

Command `rm -rf /workspace/ponylang__ponyc__0.1/build && mkdir -p /workspace/ponylang__ponyc__0.1/build/build_release && cd /workspace/ponylang__ponyc__0.1 && make` executed with exit code 2.

Running command: cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -B . -S /workspace/ponylang__ponyc__0.1

The error "could not load cache" still persists. Let's try to run the CMake command manually to see if it provides more insight into the issue.

cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -B . -S /workspace/ponylang__ponyc__0.1

The error "could not load cache" still persists. Let's try to run the CMake command manually to see if it provides more insight into the issue.

Command `cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -B . -S /workspace/ponylang__ponyc__0.1` executed with exit code 1.

-- The C compiler identification is GNU 11.4.0
-- The CXX compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:27 (find_package):
  Could not find a package configuration file provided by "LLVM" with any of
  the following names:

    LLVMConfig.cmake
    llvm-config.cmake

  Add the installation prefix of "LLVM" to CMAKE_PREFIX_PATH or set
  "LLVM_DIR" to a directory containing one of the above files.  If "LLVM"
  provides a separate development package or SDK, be sure it has been
  installed.

-- Configuring incomplete, errors occurred!
See also "/workspace/ponylang__ponyc__0.1/build/build_release/CMakeFiles/CMakeOutput.log".

Running command: apt-get update && apt-get install -y llvm-dev

The CMake command is failing because it can't find the LLVM package. This is likely because the LLVM development package is not installed.

Let's try to install the LLVM development package.

apt-get update && apt-get install -y llvm-dev

The CMake command is failing because it can't find the LLVM package. This is likely because the LLVM development package is not installed.

Let's try to install the LLVM development package.

Command `apt-get update && apt-get install -y llvm-dev` executed with exit code 100.

Ign:1 http://archive.ubuntu.com/ubuntu jammy InRelease
Ign:2 http://security.ubuntu.com/ubuntu jammy-security InRelease
Ign:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
Ign:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
Ign:1 http://archive.ubuntu.com/ubuntu jammy InRelease
Ign:2 http://security.ubuntu.com/ubuntu jammy-security InRelease
Ign:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
Ign:2 http://security.ubuntu.com/ubuntu jammy-security InRelease
Ign:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
Err:2 http://security.ubuntu.com/ubuntu jammy-security InRelease
  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
Ign:1 http://archive.ubuntu.com/ubuntu jammy InRelease
Ign:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
Ign:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
Err:1 http://archive.ubuntu.com/ubuntu jammy InRelease
  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
Err:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
Err:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
Reading package lists... Done
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease  Temporary failure resolving 'sys-proxy-rd-relay.byted.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package llvm-dev

[The command completed with exit code 100.]

Running command: apt-cache search llvm

It seems that the `llvm-dev` package is not available in the package list, and there's an issue with resolving the package repository URLs.

Let's try to check if there's an alternative package for LLVM development files.

It seems that the `llvm-dev` package is not available in the package list, and there's an issue with resolving the package repository URLs.

Let's try to check if there's an alternative package for LLVM development files.

Command `apt-cache search llvm` executed with exit code 0.

clang - C, C++ and Objective-C compiler (LLVM based), clang binary
clang-14 - C, C++ and Objective-C compiler
libclang-common-14-dev - Clang library - Common development package
libclang-cpp14 - C++ interface to the Clang library
libclang1-14 - C interface to the Clang library
libllvm14 - Modular compiler and toolchain technologies, runtime library
libllvm15 - Modular compiler and toolchain technologies, runtime library
llvm-14 - Modular compiler and toolchain technologies
llvm-14-dev - Modular compiler and toolchain technologies, libraries and headers
llvm-14-linker-tools - Modular compiler and toolchain technologies - Plugins
llvm-14-runtime - Modular compiler and toolchain technologies, IR interpreter
llvm-14-tools - Modular compiler and toolchain technologies, tools

Running command: apt-get install -y llvm-14-dev

The output shows that there are several LLVM-related packages available. Let's try to install `llvm-14-dev` instead of `llvm-dev`.

The output shows that there are several LLVM-related packages available. Let's try to install `llvm-14-dev` instead of `llvm-dev`.

Command `apt-get install -y llvm-14-dev` executed with exit code 0.

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
llvm-14-dev is already the newest version (1:14.0.0-1ubuntu1.1).
llvm-14-dev set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Running command: export LLVM_DIR=/usr/lib/llvm-14/cmake && cd /workspace/ponylang__ponyc__0.1 && make

It seems that `llvm-14-dev` is already installed. Let's try to set the `LLVM_DIR` environment variable to help CMake find the LLVM package.

export LLVM_DIR=/usr/lib/llvm-14/cmake && cd /workspace/ponylang__ponyc__0.1 && make

It seems that `llvm-14-dev` is already installed. Let's try to set the `LLVM_DIR` environment variable to help CMake find the LLVM package.

Command `export LLVM_DIR=/usr/lib/llvm-14/cmake && cd /workspace/ponylang__ponyc__0.1 && make` executed with exit code 2.

gmake[1]: Entering directory '/workspace/ponylang__ponyc__0.1/build/build_release'
gmake[1]: Makefile: No such file or directory
gmake[1]: *** No rule to make target 'Makefile'.  Stop.
gmake[1]: Leaving directory '/workspace/ponylang__ponyc__0.1/build/build_release'
make: *** [Makefile:192: build] Error 2

Running command: export LLVM_DIR=/usr/lib/llvm-14/cmake && cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -B . -S /workspace/ponylang__ponyc__0.1

It seems that the `make` command is still failing. Let's try to run the CMake command manually again with the `LLVM_DIR` environment variable set.

export LLVM_DIR=/usr/lib/llvm-14/cmake && cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -B . -S /workspace/ponylang__ponyc__0.1

It seems that the `make` command is still failing. Let's try to run the CMake command manually again with the `LLVM_DIR` environment variable set.

Command `export LLVM_DIR=/usr/lib/llvm-14/cmake && cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -B . -S /workspace/ponylang__ponyc__0.1` executed with exit code 1.

Running command: cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -DLLVM_DIR=/usr/lib/llvm-14/cmake -B . -S /workspace/ponylang__ponyc__0.1

It seems that the `LLVM_DIR` environment variable is not being picked up by the CMake command. Let's try to set it directly in the CMake command.

cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -DLLVM_DIR=/usr/lib/llvm-14/cmake -B . -S /workspace/ponylang__ponyc__0.1

It seems that the `LLVM_DIR` environment variable is not being picked up by the CMake command. Let's try to set it directly in the CMake command.

Command `cd /workspace/ponylang__ponyc__0.1/build/build_release && cmake -DLLVM_DIR=/usr/lib/llvm-14/cmake -B . -S /workspace/ponylang__ponyc__0.1` executed with exit code 1.

-- Performing Test HAVE_FFI_CALL
-- Performing Test HAVE_FFI_CALL - Success
-- Found FFI: /usr/lib/x86_64-linux-gnu/libffi.so
-- Performing Test Terminfo_LINKABLE
-- Performing Test Terminfo_LINKABLE - Success
-- Found Terminfo: /usr/lib/x86_64-linux-gnu/libtinfo.so
-- Could NOT find ZLIB (missing: ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
-- Found LibXml2: /usr/lib/x86_64-linux-gnu/libxml2.so (found version "2.9.13")
CMake Error at CMakeLists.txt:28 (find_package):
  Could not find a package configuration file provided by "GTest" with any of
  the following names:

    GTestConfig.cmake
    gtest-config.cmake

  Add the installation prefix of "GTest" to CMAKE_PREFIX_PATH or set
  "GTest_DIR" to a directory containing one of the above files.  If "GTest"
  provides a separate development package or SDK, be sure it has been
  installed.

-- Configuring incomplete, errors occurred!
See also "/workspace/ponylang__ponyc__0.1/build/build_release/CMakeFiles/CMakeOutput.log".

Running command: apt-get install -y libgtest-dev

It seems that the CMake command is now failing because it can't find the GTest package. Let's try to install the GTest development package.

It seems that the CMake command is now failing because it can't find the GTest package. Let's try to install the GTest development package.

Command `apt-get install -y libgtest-dev` executed with exit code 100.

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package libgtest-dev

RuntimeError: Agent reached maximum iteration in headless mode. Current iteration: 50, max iteration: 50