We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
`let` doesn't detect assignments in loop clauses of comprehension forms
```
=> (let [x 10] (lfor  x (range 5)  :if (> x 1)  x))
[10 10 10 10 10]
```

`hy --spy` shows this compiles to:

```
_hy_let_x_1 = 10
[_hy_let_x_1 for x in range(5) if _hy_let_x_1 > 1]
```

`let` is supposed to allow some kinds of assignments to shadow its own variables, while allowing other kinds to modify its variables, but its treatment of the loop variable seems inconsistent here.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `hy/scoping.py`
Content:
```
1 "Scope and variable tracking for Hy/Python scopes."
2 
3 import ast
4 import itertools
5 from abc import ABC, abstractmethod
6 
7 import hy._compat
8 from hy.errors import HyInternalError
9 from hy.lex import mangle
10 from hy.models import Expression, List, Symbol
11 
12 
13 def is_function_scope(scope):
14     return isinstance(scope, ScopeFn) and scope.is_fn
15 
16 
17 def is_inside_function_scope(scope):
18     "True if any enclosing scope (including this one) is a function scope."
19     cur = scope
20     while not isinstance(cur, ScopeGlobal):
21         if is_function_scope(cur):
22             return True
23         cur = cur.parent
24     return False
25 
26 
27 def nearest_python_scope(scope):
28     "Return the closest enclosing scope that corresponds to a Python scope."
29     cur = scope
30     while isinstance(cur, (ScopeLet, ScopeGen)):
31         cur = cur.parent
32     return cur
33 
34 
35 class NodeRef:
36     """
37     Wrapper for AST nodes that have symbol names, so that we can rename them if
38     necessary. Each `NodeRef` corresponds to one Python identifier. `ast` nodes
39     that accept multiple identifier names (`global`, `nonlocal`, etc) have
40     their specific identifier referenced by their `index` in the list of
41     `names` provided by the `ast` node.
42     """
43 
44     ACCESSOR = {
45         ast.Name: "id",
46         ast.Global: "names",
47         ast.Nonlocal: "names",
48     }
49     if hy._compat.PY3_10:
50         ACCESSOR.update(
51             {
52                 ast.MatchAs: "name",
53                 ast.MatchStar: "name",
54                 ast.MatchMapping: "rest",
55             }
56         )
57 
58     def __init__(self, node, index=None):
59         self.node = node
60         self.index = index
61         self._accessor = NodeRef.ACCESSOR[type(self.node)]
62 
63     @property
64     def name(self):
65         res = getattr(self.node, self._accessor)
66         if self.index is not None:
67             return res[self.index]
68         return res
69 
70     @name.setter
71     def name(self, new_name):
72         "Used to rename `ast` identifiers"
73         if self.index is not None:
74             getattr(self.node, self._accessor)[self.index] = new_name
75         else:
76             setattr(self.node, self._accessor, new_name)
77 
78     @staticmethod
79     def wrap(f):
80         "Decorator to convert AST node parameter to NodeRef."
81 
82         def _wrapper(self, node, index=None):
83             if not isinstance(node, NodeRef):
84                 node = NodeRef(node, index)
85             return f(self, node)
86 
87         return _wrapper
88 
89     def __repr__(self):
90         return (
91             f"NodeRef(name={self.name}, node={type(self.node).__name__},"
92             f" index={self.index})"
93         )
94 
95 
96 class ScopeBase(ABC):
97     def __init__(self, compiler):
98         self.parent = None
99         self.compiler = compiler
100 
101     def create(self, scope_type, *args):
102         "Create new scope from this one."
103         return scope_type(self.compiler, *args)
104 
105     def __enter__(self):
106         self.parent = self.compiler.scope
107         self.compiler.scope = self
108         return self
109 
110     def __exit__(self, *args):
111         self.compiler.scope = self.parent
112         self.parent = None
113         return False
114 
115     # Scope interface
116     @abstractmethod
117     def access(self, node, index=None):
118         "Called when a symbol is accessed."
119         ...
120 
121     @abstractmethod
122     def assign(self, node, index=None):
123         "Called when a symbol is assigned to."
124         ...
125 
126     @abstractmethod
127     def define(self, name):
128         """
129         Called when a symbol is defined.
130         (e.g., function names, class names, imports)
131         """
132         ...
133 
134     @abstractmethod
135     def define_nonlocal(self, node, root):
136         "Called when a symbol is declared nonlocal or global."
137         ...
138 
139 
140 class ScopeGlobal(ScopeBase):
141     """Global scope."""
142 
143     def __init__(self, compiler):
144         super().__init__(compiler)
145         self.defined = set()
146         "set: of all symbols created or assigned to in this scope"
147 
148         self.nonlocal_vars = []
149         """
150         list: of all `nonlocal`'s defined in this scope.
151 
152         Explicitly not a `set` so that we maintain the order they were defined in
153         """
154 
155     def __exit__(self, *args):
156         nonlocal_vars = self.nonlocal_vars
157         self.nonlocal_vars = []
158         if not self.defined.issuperset(nonlocal_vars):
159             raise SyntaxError(f"no binding for nonlocal '{nonlocal_vars[0]}'")
160         return super().__exit__(*args)
161 
162     @NodeRef.wrap
163     def access(self, node, index=0):
164         return node.node
165 
166     @NodeRef.wrap
167     def assign(self, node):
168         self.define(node.name)
169         return node.node
170 
171     def define(self, name):
172         self.defined.add(name)
173 
174     def define_nonlocal(self, node, root):
175         if root == "nonlocal":
176             self.nonlocal_vars.extend(node.names)
177         else:
178             self.defined.update(node.names)
179 
180 
181 class ScopeLet(ScopeBase):
182     """
183     Scope that supports let-binding by renaming bound symbols as they are
184     accessed/assigned. Defined symbols are never renamed.
185     """
186 
187     def __init__(self, compiler):
188         super().__init__(compiler)
189         self.bindings = {}
190 
191     def _rename_if_bound(self, node):
192         if node.name in self.bindings:
193             node.name = self.bindings[node.name]
194             return True
195         return False
196 
197     @NodeRef.wrap
198     def access(self, node):
199         self._rename_if_bound(node) or self.parent.access(node)
200         return node.node
201 
202     @NodeRef.wrap
203     def assign(self, node):
204         self._rename_if_bound(node) or self.parent.assign(node)
205         return node.node
206 
207     def define(self, name):
208         self.bindings.pop(name, None)
209         self.parent.define(name)
210 
211     def define_nonlocal(self, node, root):
212         # remove nonlocal defs of any let scopes in this Python scope
213         cur = self
214         while isinstance(cur, ScopeLet):
215             for name in node.names:
216                 if root == "nonlocal":
217                     if name in cur.bindings and cur is not self:
218                         node.names.remove(name)
219                 else:
220                     cur.bindings[name] = name
221             cur = cur.parent
222         cur.define_nonlocal(node, root)
223 
224     def add(self, target, new_name=None):
225         """Add a new let-binding target, mapped to a new, unique name."""
226         if isinstance(target, (str, Symbol)):
227             if "." in target:
228                 raise ValueError("binding target may not contain a dot")
229             name = mangle(target)
230             if new_name is None:
231                 new_name = self.compiler.get_anon_var(f"_hy_let_{name}")
232             self.bindings[name] = new_name
233             if isinstance(target, Symbol):
234                 return Symbol(new_name).replace(target)
235             return new_name
236         if new_name is not None:
237             raise ValueError("cannot specify name for compound targets")
238         if isinstance(target, List):
239             return List(map(self.add, target)).replace(target)
240         if (
241             isinstance(target, Expression)
242             and target
243             and target[0] in (Symbol(","), Symbol("unpack-iterable"))
244         ):
245             return Expression([target[0], *map(self.add, target[1:])]).replace(target)
246         raise ValueError(f"invalid binding target: {type(target)}")
247 
248 
249 class ScopeFn(ScopeBase):
250     """Scope that corresponds to Python's own function or class scopes."""
251 
252     def __init__(self, compiler, args=None):
253         super().__init__(compiler)
254         self.defined = set()
255         "set: of all vars defined in this scope"
256         self.seen = []
257         "list: of all vars accessedto in this scope"
258         self.nonlocal_vars = set()
259         "set: of all `nonlocal`'s defined in this scope"
260         self.is_fn = args is not None
261         """
262         bool: `True` if this scope is being used to track a python
263         function `False` for classes
264         """
265 
266         if args:
267             for arg in itertools.chain(
268                 args.args, args.posonlyargs, args.kwonlyargs, [args.vararg, args.kwarg]
269             ):
270                 if arg:
271                     self.define(arg.arg)
272 
273     def __exit__(self, *args):
274         for node in self.seen:
275             if node.name not in self.defined or node.name in self.nonlocal_vars:
276                 # pass unbound/nonlocal names up to parent scope
277                 self.parent.access(node)
278         return super().__exit__(*args)
279 
280     @NodeRef.wrap
281     def access(self, node):
282         self.seen.append(node)
283         return node.node
284 
285     @NodeRef.wrap
286     def assign(self, node):
287         self.access(node)
288         self.define(node.name)
289         return node.node
290 
291     def define(self, name):
292         self.defined.add(name)
293 
294     def define_nonlocal(self, node, root):
295         (
296             (self.nonlocal_vars if root == "nonlocal" else self.defined).update(
297                 node.names
298             )
299         )
300         for n in self.seen:
301             if n.name in node.names:
302                 raise SyntaxError(
303                     f"name '{n.name}' is declared {root} after being used"
304                 )
305         if root == "nonlocal":
306             # toss all nonlocal names up to parent scope
307             for i in range(len(node.names)):
308                 self.parent.access(node, i)
309 
310 
311 class ScopeGen(ScopeFn):
312     """
313     Scope that supports generator forms (`lfor`, `gfor`, ...). If this scope is
314     contained within a function scope or the global scope, then any variable
315     assignments are "leaked out" to the parent scope, mimicking Python's inline
316     generator semantics.
317 
318     .. note::
319        see :pep:`572#why-not-use-a-sublocal-scope-and-prevent-namespace-pollution`
320        for more details on how and when variables are leaked into enclosing scopes.
321     """
322 
323     def __init__(self, compiler):
324         super().__init__(compiler)
325         self.iterators = set()
326         self.assignments = []
327         self.nonlocals = set()
328         self.exposing_assignments = False
329 
330     def __enter__(self):
331         super().__enter__()
332         enclosing = nearest_python_scope(self.parent)
333         if isinstance(enclosing, ScopeGlobal) or is_function_scope(enclosing):
334             # only "leak out" assignments if we're contained in a function
335             # (or global) scope
336             self.exposing_assignments = True
337         return self
338 
339     def finalize(self):
340         """
341         Access and return all the identifiers created and potentially leaked
342         out by this generator. This should be called once and only once we've
343         processed all of the iterators in this generators so as not to leak out
344         any unwanted identifiers
345         """
346         res = set()
347         for node in self.assignments:
348             if node.name not in self.nonlocal_vars:
349                 self.parent.access(node)
350                 res.add(node.name)
351         return sorted(res)
352 
353     @NodeRef.wrap
354     def assign(self, node):
355         self.access(node)
356         if node.name not in self.defined:
357             self.assignments.append(node)
358         return node.node
359 
360     def iterator(self, target):
361         """
362         Declare an iteration variable name for this scope; as in Python, the
363         iteration variable(s) cannot be reassigned.
364         """
365         self.iterators.update(
366             name.id for name in ast.walk(target) if isinstance(name, ast.Name)
367         )
368         # remove potentially leakable identifiers that were actually iteration
369         # variables found in `target`
370         self.assignments = [
371             node for node in self.assignments if node.name not in self.iterators
372         ]
373         self.seen = [node for node in self.seen if node.name not in self.iterators]
374
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/hy/scoping.py b/hy/scoping.py
--- a/hy/scoping.py
+++ b/hy/scoping.py
@@ -357,6 +357,12 @@
             self.assignments.append(node)
         return node.node
 
+    @NodeRef.wrap
+    def access(self, node):
+        if not node.name in self.iterators:
+            self.seen.append(node)
+        return node.node
+
     def iterator(self, target):
         """
         Declare an iteration variable name for this scope; as in Python, the

{"golden_diff": "diff --git a/hy/scoping.py b/hy/scoping.py\n--- a/hy/scoping.py\n+++ b/hy/scoping.py\n@@ -357,6 +357,12 @@\n             self.assignments.append(node)\n         return node.node\n \n+    @NodeRef.wrap\n+    def access(self, node):\n+        if not node.name in self.iterators:\n+            self.seen.append(node)\n+        return node.node\n+\n     def iterator(self, target):\n         \"\"\"\n         Declare an iteration variable name for this scope; as in Python, the\n", "issue": "`let` doesn't detect assignments in loop clauses of comprehension forms\n```\r\n=> (let [x 10] (lfor  x (range 5)  :if (> x 1)  x))\r\n[10 10 10 10 10]\r\n```\r\n\r\n`hy --spy` shows this compiles to:\r\n\r\n```\r\n_hy_let_x_1 = 10\r\n[_hy_let_x_1 for x in range(5) if _hy_let_x_1 > 1]\r\n```\r\n\r\n`let` is supposed to allow some kinds of assignments to shadow its own variables, while allowing other kinds to modify its variables, but its treatment of the loop variable seems inconsistent here.\n", "before_files": [{"content": "\"Scope and variable tracking for Hy/Python scopes.\"\n\nimport ast\nimport itertools\nfrom abc import ABC, abstractmethod\n\nimport hy._compat\nfrom hy.errors import HyInternalError\nfrom hy.lex import mangle\nfrom hy.models import Expression, List, Symbol\n\n\ndef is_function_scope(scope):\n    return isinstance(scope, ScopeFn) and scope.is_fn\n\n\ndef is_inside_function_scope(scope):\n    \"True if any enclosing scope (including this one) is a function scope.\"\n    cur = scope\n    while not isinstance(cur, ScopeGlobal):\n        if is_function_scope(cur):\n            return True\n        cur = cur.parent\n    return False\n\n\ndef nearest_python_scope(scope):\n    \"Return the closest enclosing scope that corresponds to a Python scope.\"\n    cur = scope\n    while isinstance(cur, (ScopeLet, ScopeGen)):\n        cur = cur.parent\n    return cur\n\n\nclass NodeRef:\n    \"\"\"\n    Wrapper for AST nodes that have symbol names, so that we can rename them if\n    necessary. Each `NodeRef` corresponds to one Python identifier. `ast` nodes\n    that accept multiple identifier names (`global`, `nonlocal`, etc) have\n    their specific identifier referenced by their `index` in the list of\n    `names` provided by the `ast` node.\n    \"\"\"\n\n    ACCESSOR = {\n        ast.Name: \"id\",\n        ast.Global: \"names\",\n        ast.Nonlocal: \"names\",\n    }\n    if hy._compat.PY3_10:\n        ACCESSOR.update(\n            {\n                ast.MatchAs: \"name\",\n                ast.MatchStar: \"name\",\n                ast.MatchMapping: \"rest\",\n            }\n        )\n\n    def __init__(self, node, index=None):\n        self.node = node\n        self.index = index\n        self._accessor = NodeRef.ACCESSOR[type(self.node)]\n\n    @property\n    def name(self):\n        res = getattr(self.node, self._accessor)\n        if self.index is not None:\n            return res[self.index]\n        return res\n\n    @name.setter\n    def name(self, new_name):\n        \"Used to rename `ast` identifiers\"\n        if self.index is not None:\n            getattr(self.node, self._accessor)[self.index] = new_name\n        else:\n            setattr(self.node, self._accessor, new_name)\n\n    @staticmethod\n    def wrap(f):\n        \"Decorator to convert AST node parameter to NodeRef.\"\n\n        def _wrapper(self, node, index=None):\n            if not isinstance(node, NodeRef):\n                node = NodeRef(node, index)\n            return f(self, node)\n\n        return _wrapper\n\n    def __repr__(self):\n        return (\n            f\"NodeRef(name={self.name}, node={type(self.node).__name__},\"\n            f\" index={self.index})\"\n        )\n\n\nclass ScopeBase(ABC):\n    def __init__(self, compiler):\n        self.parent = None\n        self.compiler = compiler\n\n    def create(self, scope_type, *args):\n        \"Create new scope from this one.\"\n        return scope_type(self.compiler, *args)\n\n    def __enter__(self):\n        self.parent = self.compiler.scope\n        self.compiler.scope = self\n        return self\n\n    def __exit__(self, *args):\n        self.compiler.scope = self.parent\n        self.parent = None\n        return False\n\n    # Scope interface\n    @abstractmethod\n    def access(self, node, index=None):\n        \"Called when a symbol is accessed.\"\n        ...\n\n    @abstractmethod\n    def assign(self, node, index=None):\n        \"Called when a symbol is assigned to.\"\n        ...\n\n    @abstractmethod\n    def define(self, name):\n        \"\"\"\n        Called when a symbol is defined.\n        (e.g., function names, class names, imports)\n        \"\"\"\n        ...\n\n    @abstractmethod\n    def define_nonlocal(self, node, root):\n        \"Called when a symbol is declared nonlocal or global.\"\n        ...\n\n\nclass ScopeGlobal(ScopeBase):\n    \"\"\"Global scope.\"\"\"\n\n    def __init__(self, compiler):\n        super().__init__(compiler)\n        self.defined = set()\n        \"set: of all symbols created or assigned to in this scope\"\n\n        self.nonlocal_vars = []\n        \"\"\"\n        list: of all `nonlocal`'s defined in this scope.\n\n        Explicitly not a `set` so that we maintain the order they were defined in\n        \"\"\"\n\n    def __exit__(self, *args):\n        nonlocal_vars = self.nonlocal_vars\n        self.nonlocal_vars = []\n        if not self.defined.issuperset(nonlocal_vars):\n            raise SyntaxError(f\"no binding for nonlocal '{nonlocal_vars[0]}'\")\n        return super().__exit__(*args)\n\n    @NodeRef.wrap\n    def access(self, node, index=0):\n        return node.node\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self.define(node.name)\n        return node.node\n\n    def define(self, name):\n        self.defined.add(name)\n\n    def define_nonlocal(self, node, root):\n        if root == \"nonlocal\":\n            self.nonlocal_vars.extend(node.names)\n        else:\n            self.defined.update(node.names)\n\n\nclass ScopeLet(ScopeBase):\n    \"\"\"\n    Scope that supports let-binding by renaming bound symbols as they are\n    accessed/assigned. Defined symbols are never renamed.\n    \"\"\"\n\n    def __init__(self, compiler):\n        super().__init__(compiler)\n        self.bindings = {}\n\n    def _rename_if_bound(self, node):\n        if node.name in self.bindings:\n            node.name = self.bindings[node.name]\n            return True\n        return False\n\n    @NodeRef.wrap\n    def access(self, node):\n        self._rename_if_bound(node) or self.parent.access(node)\n        return node.node\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self._rename_if_bound(node) or self.parent.assign(node)\n        return node.node\n\n    def define(self, name):\n        self.bindings.pop(name, None)\n        self.parent.define(name)\n\n    def define_nonlocal(self, node, root):\n        # remove nonlocal defs of any let scopes in this Python scope\n        cur = self\n        while isinstance(cur, ScopeLet):\n            for name in node.names:\n                if root == \"nonlocal\":\n                    if name in cur.bindings and cur is not self:\n                        node.names.remove(name)\n                else:\n                    cur.bindings[name] = name\n            cur = cur.parent\n        cur.define_nonlocal(node, root)\n\n    def add(self, target, new_name=None):\n        \"\"\"Add a new let-binding target, mapped to a new, unique name.\"\"\"\n        if isinstance(target, (str, Symbol)):\n            if \".\" in target:\n                raise ValueError(\"binding target may not contain a dot\")\n            name = mangle(target)\n            if new_name is None:\n                new_name = self.compiler.get_anon_var(f\"_hy_let_{name}\")\n            self.bindings[name] = new_name\n            if isinstance(target, Symbol):\n                return Symbol(new_name).replace(target)\n            return new_name\n        if new_name is not None:\n            raise ValueError(\"cannot specify name for compound targets\")\n        if isinstance(target, List):\n            return List(map(self.add, target)).replace(target)\n        if (\n            isinstance(target, Expression)\n            and target\n            and target[0] in (Symbol(\",\"), Symbol(\"unpack-iterable\"))\n        ):\n            return Expression([target[0], *map(self.add, target[1:])]).replace(target)\n        raise ValueError(f\"invalid binding target: {type(target)}\")\n\n\nclass ScopeFn(ScopeBase):\n    \"\"\"Scope that corresponds to Python's own function or class scopes.\"\"\"\n\n    def __init__(self, compiler, args=None):\n        super().__init__(compiler)\n        self.defined = set()\n        \"set: of all vars defined in this scope\"\n        self.seen = []\n        \"list: of all vars accessedto in this scope\"\n        self.nonlocal_vars = set()\n        \"set: of all `nonlocal`'s defined in this scope\"\n        self.is_fn = args is not None\n        \"\"\"\n        bool: `True` if this scope is being used to track a python\n        function `False` for classes\n        \"\"\"\n\n        if args:\n            for arg in itertools.chain(\n                args.args, args.posonlyargs, args.kwonlyargs, [args.vararg, args.kwarg]\n            ):\n                if arg:\n                    self.define(arg.arg)\n\n    def __exit__(self, *args):\n        for node in self.seen:\n            if node.name not in self.defined or node.name in self.nonlocal_vars:\n                # pass unbound/nonlocal names up to parent scope\n                self.parent.access(node)\n        return super().__exit__(*args)\n\n    @NodeRef.wrap\n    def access(self, node):\n        self.seen.append(node)\n        return node.node\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self.access(node)\n        self.define(node.name)\n        return node.node\n\n    def define(self, name):\n        self.defined.add(name)\n\n    def define_nonlocal(self, node, root):\n        (\n            (self.nonlocal_vars if root == \"nonlocal\" else self.defined).update(\n                node.names\n            )\n        )\n        for n in self.seen:\n            if n.name in node.names:\n                raise SyntaxError(\n                    f\"name '{n.name}' is declared {root} after being used\"\n                )\n        if root == \"nonlocal\":\n            # toss all nonlocal names up to parent scope\n            for i in range(len(node.names)):\n                self.parent.access(node, i)\n\n\nclass ScopeGen(ScopeFn):\n    \"\"\"\n    Scope that supports generator forms (`lfor`, `gfor`, ...). If this scope is\n    contained within a function scope or the global scope, then any variable\n    assignments are \"leaked out\" to the parent scope, mimicking Python's inline\n    generator semantics.\n\n    .. note::\n       see :pep:`572#why-not-use-a-sublocal-scope-and-prevent-namespace-pollution`\n       for more details on how and when variables are leaked into enclosing scopes.\n    \"\"\"\n\n    def __init__(self, compiler):\n        super().__init__(compiler)\n        self.iterators = set()\n        self.assignments = []\n        self.nonlocals = set()\n        self.exposing_assignments = False\n\n    def __enter__(self):\n        super().__enter__()\n        enclosing = nearest_python_scope(self.parent)\n        if isinstance(enclosing, ScopeGlobal) or is_function_scope(enclosing):\n            # only \"leak out\" assignments if we're contained in a function\n            # (or global) scope\n            self.exposing_assignments = True\n        return self\n\n    def finalize(self):\n        \"\"\"\n        Access and return all the identifiers created and potentially leaked\n        out by this generator. This should be called once and only once we've\n        processed all of the iterators in this generators so as not to leak out\n        any unwanted identifiers\n        \"\"\"\n        res = set()\n        for node in self.assignments:\n            if node.name not in self.nonlocal_vars:\n                self.parent.access(node)\n                res.add(node.name)\n        return sorted(res)\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self.access(node)\n        if node.name not in self.defined:\n            self.assignments.append(node)\n        return node.node\n\n    def iterator(self, target):\n        \"\"\"\n        Declare an iteration variable name for this scope; as in Python, the\n        iteration variable(s) cannot be reassigned.\n        \"\"\"\n        self.iterators.update(\n            name.id for name in ast.walk(target) if isinstance(name, ast.Name)\n        )\n        # remove potentially leakable identifiers that were actually iteration\n        # variables found in `target`\n        self.assignments = [\n            node for node in self.assignments if node.name not in self.iterators\n        ]\n        self.seen = [node for node in self.seen if node.name not in self.iterators]\n", "path": "hy/scoping.py"}], "after_files": [{"content": "\"Scope and variable tracking for Hy/Python scopes.\"\n\nimport ast\nimport itertools\nfrom abc import ABC, abstractmethod\n\nimport hy._compat\nfrom hy.errors import HyInternalError\nfrom hy.lex import mangle\nfrom hy.models import Expression, List, Symbol\n\n\ndef is_function_scope(scope):\n    return isinstance(scope, ScopeFn) and scope.is_fn\n\n\ndef is_inside_function_scope(scope):\n    \"True if any enclosing scope (including this one) is a function scope.\"\n    cur = scope\n    while not isinstance(cur, ScopeGlobal):\n        if is_function_scope(cur):\n            return True\n        cur = cur.parent\n    return False\n\n\ndef nearest_python_scope(scope):\n    \"Return the closest enclosing scope that corresponds to a Python scope.\"\n    cur = scope\n    while isinstance(cur, (ScopeLet, ScopeGen)):\n        cur = cur.parent\n    return cur\n\n\nclass NodeRef:\n    \"\"\"\n    Wrapper for AST nodes that have symbol names, so that we can rename them if\n    necessary. Each `NodeRef` corresponds to one Python identifier. `ast` nodes\n    that accept multiple identifier names (`global`, `nonlocal`, etc) have\n    their specific identifier referenced by their `index` in the list of\n    `names` provided by the `ast` node.\n    \"\"\"\n\n    ACCESSOR = {\n        ast.Name: \"id\",\n        ast.Global: \"names\",\n        ast.Nonlocal: \"names\",\n    }\n    if hy._compat.PY3_10:\n        ACCESSOR.update(\n            {\n                ast.MatchAs: \"name\",\n                ast.MatchStar: \"name\",\n                ast.MatchMapping: \"rest\",\n            }\n        )\n\n    def __init__(self, node, index=None):\n        self.node = node\n        self.index = index\n        self._accessor = NodeRef.ACCESSOR[type(self.node)]\n\n    @property\n    def name(self):\n        res = getattr(self.node, self._accessor)\n        if self.index is not None:\n            return res[self.index]\n        return res\n\n    @name.setter\n    def name(self, new_name):\n        \"Used to rename `ast` identifiers\"\n        if self.index is not None:\n            getattr(self.node, self._accessor)[self.index] = new_name\n        else:\n            setattr(self.node, self._accessor, new_name)\n\n    @staticmethod\n    def wrap(f):\n        \"Decorator to convert AST node parameter to NodeRef.\"\n\n        def _wrapper(self, node, index=None):\n            if not isinstance(node, NodeRef):\n                node = NodeRef(node, index)\n            return f(self, node)\n\n        return _wrapper\n\n    def __repr__(self):\n        return (\n            f\"NodeRef(name={self.name}, node={type(self.node).__name__},\"\n            f\" index={self.index})\"\n        )\n\n\nclass ScopeBase(ABC):\n    def __init__(self, compiler):\n        self.parent = None\n        self.compiler = compiler\n\n    def create(self, scope_type, *args):\n        \"Create new scope from this one.\"\n        return scope_type(self.compiler, *args)\n\n    def __enter__(self):\n        self.parent = self.compiler.scope\n        self.compiler.scope = self\n        return self\n\n    def __exit__(self, *args):\n        self.compiler.scope = self.parent\n        self.parent = None\n        return False\n\n    # Scope interface\n    @abstractmethod\n    def access(self, node, index=None):\n        \"Called when a symbol is accessed.\"\n        ...\n\n    @abstractmethod\n    def assign(self, node, index=None):\n        \"Called when a symbol is assigned to.\"\n        ...\n\n    @abstractmethod\n    def define(self, name):\n        \"\"\"\n        Called when a symbol is defined.\n        (e.g., function names, class names, imports)\n        \"\"\"\n        ...\n\n    @abstractmethod\n    def define_nonlocal(self, node, root):\n        \"Called when a symbol is declared nonlocal or global.\"\n        ...\n\n\nclass ScopeGlobal(ScopeBase):\n    \"\"\"Global scope.\"\"\"\n\n    def __init__(self, compiler):\n        super().__init__(compiler)\n        self.defined = set()\n        \"set: of all symbols created or assigned to in this scope\"\n\n        self.nonlocal_vars = []\n        \"\"\"\n        list: of all `nonlocal`'s defined in this scope.\n\n        Explicitly not a `set` so that we maintain the order they were defined in\n        \"\"\"\n\n    def __exit__(self, *args):\n        nonlocal_vars = self.nonlocal_vars\n        self.nonlocal_vars = []\n        if not self.defined.issuperset(nonlocal_vars):\n            raise SyntaxError(f\"no binding for nonlocal '{nonlocal_vars[0]}'\")\n        return super().__exit__(*args)\n\n    @NodeRef.wrap\n    def access(self, node, index=0):\n        return node.node\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self.define(node.name)\n        return node.node\n\n    def define(self, name):\n        self.defined.add(name)\n\n    def define_nonlocal(self, node, root):\n        if root == \"nonlocal\":\n            self.nonlocal_vars.extend(node.names)\n        else:\n            self.defined.update(node.names)\n\n\nclass ScopeLet(ScopeBase):\n    \"\"\"\n    Scope that supports let-binding by renaming bound symbols as they are\n    accessed/assigned. Defined symbols are never renamed.\n    \"\"\"\n\n    def __init__(self, compiler):\n        super().__init__(compiler)\n        self.bindings = {}\n\n    def _rename_if_bound(self, node):\n        if node.name in self.bindings:\n            node.name = self.bindings[node.name]\n            return True\n        return False\n\n    @NodeRef.wrap\n    def access(self, node):\n        self._rename_if_bound(node) or self.parent.access(node)\n        return node.node\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self._rename_if_bound(node) or self.parent.assign(node)\n        return node.node\n\n    def define(self, name):\n        self.bindings.pop(name, None)\n        self.parent.define(name)\n\n    def define_nonlocal(self, node, root):\n        # remove nonlocal defs of any let scopes in this Python scope\n        cur = self\n        while isinstance(cur, ScopeLet):\n            for name in node.names:\n                if root == \"nonlocal\":\n                    if name in cur.bindings and cur is not self:\n                        node.names.remove(name)\n                else:\n                    cur.bindings[name] = name\n            cur = cur.parent\n        cur.define_nonlocal(node, root)\n\n    def add(self, target, new_name=None):\n        \"\"\"Add a new let-binding target, mapped to a new, unique name.\"\"\"\n        if isinstance(target, (str, Symbol)):\n            if \".\" in target:\n                raise ValueError(\"binding target may not contain a dot\")\n            name = mangle(target)\n            if new_name is None:\n                new_name = self.compiler.get_anon_var(f\"_hy_let_{name}\")\n            self.bindings[name] = new_name\n            if isinstance(target, Symbol):\n                return Symbol(new_name).replace(target)\n            return new_name\n        if new_name is not None:\n            raise ValueError(\"cannot specify name for compound targets\")\n        if isinstance(target, List):\n            return List(map(self.add, target)).replace(target)\n        if (\n            isinstance(target, Expression)\n            and target\n            and target[0] in (Symbol(\",\"), Symbol(\"unpack-iterable\"))\n        ):\n            return Expression([target[0], *map(self.add, target[1:])]).replace(target)\n        raise ValueError(f\"invalid binding target: {type(target)}\")\n\n\nclass ScopeFn(ScopeBase):\n    \"\"\"Scope that corresponds to Python's own function or class scopes.\"\"\"\n\n    def __init__(self, compiler, args=None):\n        super().__init__(compiler)\n        self.defined = set()\n        \"set: of all vars defined in this scope\"\n        self.seen = []\n        \"list: of all vars accessedto in this scope\"\n        self.nonlocal_vars = set()\n        \"set: of all `nonlocal`'s defined in this scope\"\n        self.is_fn = args is not None\n        \"\"\"\n        bool: `True` if this scope is being used to track a python\n        function `False` for classes\n        \"\"\"\n\n        if args:\n            for arg in itertools.chain(\n                args.args, args.posonlyargs, args.kwonlyargs, [args.vararg, args.kwarg]\n            ):\n                if arg:\n                    self.define(arg.arg)\n\n    def __exit__(self, *args):\n        for node in self.seen:\n            if node.name not in self.defined or node.name in self.nonlocal_vars:\n                # pass unbound/nonlocal names up to parent scope\n                self.parent.access(node)\n        return super().__exit__(*args)\n\n    @NodeRef.wrap\n    def access(self, node):\n        self.seen.append(node)\n        return node.node\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self.access(node)\n        self.define(node.name)\n        return node.node\n\n    def define(self, name):\n        self.defined.add(name)\n\n    def define_nonlocal(self, node, root):\n        (\n            (self.nonlocal_vars if root == \"nonlocal\" else self.defined).update(\n                node.names\n            )\n        )\n        for n in self.seen:\n            if n.name in node.names:\n                raise SyntaxError(\n                    f\"name '{n.name}' is declared {root} after being used\"\n                )\n        if root == \"nonlocal\":\n            # toss all nonlocal names up to parent scope\n            for i in range(len(node.names)):\n                self.parent.access(node, i)\n\n\nclass ScopeGen(ScopeFn):\n    \"\"\"\n    Scope that supports generator forms (`lfor`, `gfor`, ...). If this scope is\n    contained within a function scope or the global scope, then any variable\n    assignments are \"leaked out\" to the parent scope, mimicking Python's inline\n    generator semantics.\n\n    .. note::\n       see :pep:`572#why-not-use-a-sublocal-scope-and-prevent-namespace-pollution`\n       for more details on how and when variables are leaked into enclosing scopes.\n    \"\"\"\n\n    def __init__(self, compiler):\n        super().__init__(compiler)\n        self.iterators = set()\n        self.assignments = []\n        self.nonlocals = set()\n        self.exposing_assignments = False\n\n    def __enter__(self):\n        super().__enter__()\n        enclosing = nearest_python_scope(self.parent)\n        if isinstance(enclosing, ScopeGlobal) or is_function_scope(enclosing):\n            # only \"leak out\" assignments if we're contained in a function\n            # (or global) scope\n            self.exposing_assignments = True\n        return self\n\n    def finalize(self):\n        \"\"\"\n        Access and return all the identifiers created and potentially leaked\n        out by this generator. This should be called once and only once we've\n        processed all of the iterators in this generators so as not to leak out\n        any unwanted identifiers\n        \"\"\"\n        res = set()\n        for node in self.assignments:\n            if node.name not in self.nonlocal_vars:\n                self.parent.access(node)\n                res.add(node.name)\n        return sorted(res)\n\n    @NodeRef.wrap\n    def assign(self, node):\n        self.access(node)\n        if node.name not in self.defined:\n            self.assignments.append(node)\n        return node.node\n\n    @NodeRef.wrap\n    def access(self, node):\n        if not node.name in self.iterators:\n            self.seen.append(node)\n        return node.node\n\n    def iterator(self, target):\n        \"\"\"\n        Declare an iteration variable name for this scope; as in Python, the\n        iteration variable(s) cannot be reassigned.\n        \"\"\"\n        self.iterators.update(\n            name.id for name in ast.walk(target) if isinstance(name, ast.Name)\n        )\n        # remove potentially leakable identifiers that were actually iteration\n        # variables found in `target`\n        self.assignments = [\n            node for node in self.assignments if node.name not in self.iterators\n        ]\n        self.seen = [node for node in self.seen if node.name not in self.iterators]\n", "path": "hy/scoping.py"}]}