We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Add docs for assert_modifiable

### What's your issue about?

`assert_modifiable` was added in #1480 add docs for it.

### How can it be fixed?

`^.^`


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `docs/conf.py`
Content:
```
1 #!/usr/bin/env python3
2 # -*- coding: utf-8 -*-
3 #
4 # Vyper documentation build configuration file, created by
5 # sphinx-quickstart on Wed Jul 26 11:18:29 2017.
6 #
7 # This file is execfile()d with the current directory set to its
8 # containing dir.
9 #
10 # Note that not all possible configuration values are present in this
11 # autogenerated file.
12 #
13 # All configuration values have a default; values that are commented out
14 # serve to show the default.
15 
16 # If extensions (or modules to document with autodoc) are in another directory,
17 # add these directories to sys.path here. If the directory is relative to the
18 # documentation root, use os.path.abspath to make it absolute, like shown here.
19 #
20 # import os
21 # import sys
22 # sys.path.insert(0, os.path.abspath('.'))
23 from recommonmark.parser import CommonMarkParser
24 
25 # TO DO - Create and Implement Vyper Lexer
26 # def setup(sphinx):
27 #     sys.path.insert(0, os.path.abspath('./utils'))
28 #     from SolidityLexer import SolidityLexer
29 #     sphinx.add_lexer('Python', SolidityLexer())
30 
31 
32 # -- General configuration ------------------------------------------------
33 
34 # If your documentation needs a minimal Sphinx version, state it here.
35 #
36 # needs_sphinx = '1.0'
37 
38 # Add any Sphinx extension module names here, as strings. They can be
39 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
40 # ones.
41 extensions = [
42     'sphinx.ext.autodoc'
43 ]
44 
45 # Add any paths that contain templates here, relative to this directory.
46 templates_path = ['_templates']
47 
48 # The suffix(es) of source filenames.
49 # You can specify multiple suffix as a list of string:
50 #
51 # source_suffix = ['.rst', '.md']
52 source_suffix = '.rst'
53 
54 # The master toctree document.
55 master_doc = 'index'
56 
57 # General information about the project.
58 project = 'Vyper'
59 copyright = '2017, Vitalik Buterin'
60 author = 'Vitalik Buterin'
61 
62 # The version info for the project you're documenting, acts as replacement for
63 # |version| and |release|, also used in various other places throughout the
64 # built documents.
65 #
66 # The short X.Y version.
67 version = ''
68 # The full version, including alpha/beta/rc tags.
69 release = ''
70 
71 # The language for content autogenerated by Sphinx. Refer to documentation
72 # for a list of supported languages.
73 #
74 # This is also used if you do content translation via gettext catalogs.
75 # Usually you set "language" from the command line for these cases.
76 language = 'python'
77 
78 # List of patterns, relative to source directory, that match files and
79 # directories to ignore when looking for source files.
80 # This patterns also effect to html_static_path and html_extra_path
81 exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
82 
83 # The name of the Pygments (syntax highlighting) style to use.
84 pygments_style = 'sphinx'
85 
86 # If true, `todo` and `todoList` produce output, else they produce nothing.
87 todo_include_todos = False
88 
89 
90 # -- Options for HTML output ----------------------------------------------
91 
92 # The theme to use for HTML and HTML Help pages.  See the documentation for
93 # a list of builtin themes.
94 #
95 html_theme = "sphinx_rtd_theme"
96 
97 # Theme options are theme-specific and customize the look and feel of a theme
98 # further.  For a list of options available for each theme, see the
99 # documentation.
100 #
101 # html_theme_options = {}
102 
103 # Add any paths that contain custom static files (such as style sheets) here,
104 # relative to this directory. They are copied after the builtin static files,
105 # so a file named "default.css" will overwrite the builtin "default.css".
106 html_static_path = ['_static']
107 
108 # Custom sidebar templates, must be a dictionary that maps document names
109 # to template names.
110 #
111 # This is required for the alabaster theme
112 # refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars
113 html_sidebars = {
114     '**': [
115         'about.html',
116         'navigation.html',
117         'relations.html',  # needs 'show_related': True theme option to display
118         'searchbox.html',
119         'donate.html',
120     ]
121 }
122 
123 
124 # -- Options for HTMLHelp output ------------------------------------------
125 
126 # Output file base name for HTML help builder.
127 htmlhelp_basename = 'Vyperdoc'
128 
129 
130 # -- Options for LaTeX output ---------------------------------------------
131 
132 latex_elements = {
133     # The paper size ('letterpaper' or 'a4paper').
134     #
135     # 'papersize': 'letterpaper',
136 
137     # The font size ('10pt', '11pt' or '12pt').
138     #
139     # 'pointsize': '10pt',
140 
141     # Additional stuff for the LaTeX preamble.
142     #
143     # 'preamble': '',
144 
145     # Latex figure (float) alignment
146     #
147     # 'figure_align': 'htbp',
148 }
149 
150 # Grouping the document tree into LaTeX files. List of tuples
151 # (source start file, target name, title,
152 #  author, documentclass [howto, manual, or own class]).
153 latex_documents = [
154     (master_doc, 'Vyper.tex', 'Vyper Documentation',
155      'Vitalik Buterin', 'manual'),
156 ]
157 
158 
159 # -- Options for manual page output ---------------------------------------
160 
161 # One entry per manual page. List of tuples
162 # (source start file, name, description, authors, manual section).
163 man_pages = [
164     (master_doc, 'vyper', 'Vyper Documentation',
165      [author], 1)
166 ]
167 
168 
169 # -- Options for Texinfo output -------------------------------------------
170 
171 # Grouping the document tree into Texinfo files. List of tuples
172 # (source start file, target name, title, author,
173 #  dir menu entry, description, category)
174 texinfo_documents = [
175     (master_doc, 'Vyper', 'Vyper Documentation',
176      author, 'Vyper', 'One line description of project.',
177      'Miscellaneous'),
178 ]
179 
180 source_parsers = {
181     '.md': CommonMarkParser,
182 }
183 
184 source_suffix = ['.rst', '.md']
185
```
--- 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/docs/conf.py b/docs/conf.py
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -103,7 +103,7 @@
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+# html_static_path = ['_static']
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.

{"golden_diff": "diff --git a/docs/conf.py b/docs/conf.py\n--- a/docs/conf.py\n+++ b/docs/conf.py\n@@ -103,7 +103,7 @@\n # Add any paths that contain custom static files (such as style sheets) here,\n # relative to this directory. They are copied after the builtin static files,\n # so a file named \"default.css\" will overwrite the builtin \"default.css\".\n-html_static_path = ['_static']\n+# html_static_path = ['_static']\n \n # Custom sidebar templates, must be a dictionary that maps document names\n # to template names.\n", "issue": "Add docs for assert_modifiable\n\r\n### What's your issue about?\r\n\r\n`assert_modifiable` was added in #1480 add docs for it.\r\n\r\n### How can it be fixed?\r\n\r\n`^.^`\r\n\n", "before_files": [{"content": "#!/usr/bin/env python3\n# -*- coding: utf-8 -*-\n#\n# Vyper documentation build configuration file, created by\n# sphinx-quickstart on Wed Jul 26 11:18:29 2017.\n#\n# This file is execfile()d with the current directory set to its\n# containing dir.\n#\n# Note that not all possible configuration values are present in this\n# autogenerated file.\n#\n# All configuration values have a default; values that are commented out\n# serve to show the default.\n\n# If extensions (or modules to document with autodoc) are in another directory,\n# add these directories to sys.path here. If the directory is relative to the\n# documentation root, use os.path.abspath to make it absolute, like shown here.\n#\n# import os\n# import sys\n# sys.path.insert(0, os.path.abspath('.'))\nfrom recommonmark.parser import CommonMarkParser\n\n# TO DO - Create and Implement Vyper Lexer\n# def setup(sphinx):\n#     sys.path.insert(0, os.path.abspath('./utils'))\n#     from SolidityLexer import SolidityLexer\n#     sphinx.add_lexer('Python', SolidityLexer())\n\n\n# -- General configuration ------------------------------------------------\n\n# If your documentation needs a minimal Sphinx version, state it here.\n#\n# needs_sphinx = '1.0'\n\n# Add any Sphinx extension module names here, as strings. They can be\n# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom\n# ones.\nextensions = [\n    'sphinx.ext.autodoc'\n]\n\n# Add any paths that contain templates here, relative to this directory.\ntemplates_path = ['_templates']\n\n# The suffix(es) of source filenames.\n# You can specify multiple suffix as a list of string:\n#\n# source_suffix = ['.rst', '.md']\nsource_suffix = '.rst'\n\n# The master toctree document.\nmaster_doc = 'index'\n\n# General information about the project.\nproject = 'Vyper'\ncopyright = '2017, Vitalik Buterin'\nauthor = 'Vitalik Buterin'\n\n# The version info for the project you're documenting, acts as replacement for\n# |version| and |release|, also used in various other places throughout the\n# built documents.\n#\n# The short X.Y version.\nversion = ''\n# The full version, including alpha/beta/rc tags.\nrelease = ''\n\n# The language for content autogenerated by Sphinx. Refer to documentation\n# for a list of supported languages.\n#\n# This is also used if you do content translation via gettext catalogs.\n# Usually you set \"language\" from the command line for these cases.\nlanguage = 'python'\n\n# List of patterns, relative to source directory, that match files and\n# directories to ignore when looking for source files.\n# This patterns also effect to html_static_path and html_extra_path\nexclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']\n\n# The name of the Pygments (syntax highlighting) style to use.\npygments_style = 'sphinx'\n\n# If true, `todo` and `todoList` produce output, else they produce nothing.\ntodo_include_todos = False\n\n\n# -- Options for HTML output ----------------------------------------------\n\n# The theme to use for HTML and HTML Help pages.  See the documentation for\n# a list of builtin themes.\n#\nhtml_theme = \"sphinx_rtd_theme\"\n\n# Theme options are theme-specific and customize the look and feel of a theme\n# further.  For a list of options available for each theme, see the\n# documentation.\n#\n# html_theme_options = {}\n\n# Add any paths that contain custom static files (such as style sheets) here,\n# relative to this directory. They are copied after the builtin static files,\n# so a file named \"default.css\" will overwrite the builtin \"default.css\".\nhtml_static_path = ['_static']\n\n# Custom sidebar templates, must be a dictionary that maps document names\n# to template names.\n#\n# This is required for the alabaster theme\n# refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars\nhtml_sidebars = {\n    '**': [\n        'about.html',\n        'navigation.html',\n        'relations.html',  # needs 'show_related': True theme option to display\n        'searchbox.html',\n        'donate.html',\n    ]\n}\n\n\n# -- Options for HTMLHelp output ------------------------------------------\n\n# Output file base name for HTML help builder.\nhtmlhelp_basename = 'Vyperdoc'\n\n\n# -- Options for LaTeX output ---------------------------------------------\n\nlatex_elements = {\n    # The paper size ('letterpaper' or 'a4paper').\n    #\n    # 'papersize': 'letterpaper',\n\n    # The font size ('10pt', '11pt' or '12pt').\n    #\n    # 'pointsize': '10pt',\n\n    # Additional stuff for the LaTeX preamble.\n    #\n    # 'preamble': '',\n\n    # Latex figure (float) alignment\n    #\n    # 'figure_align': 'htbp',\n}\n\n# Grouping the document tree into LaTeX files. List of tuples\n# (source start file, target name, title,\n#  author, documentclass [howto, manual, or own class]).\nlatex_documents = [\n    (master_doc, 'Vyper.tex', 'Vyper Documentation',\n     'Vitalik Buterin', 'manual'),\n]\n\n\n# -- Options for manual page output ---------------------------------------\n\n# One entry per manual page. List of tuples\n# (source start file, name, description, authors, manual section).\nman_pages = [\n    (master_doc, 'vyper', 'Vyper Documentation',\n     [author], 1)\n]\n\n\n# -- Options for Texinfo output -------------------------------------------\n\n# Grouping the document tree into Texinfo files. List of tuples\n# (source start file, target name, title, author,\n#  dir menu entry, description, category)\ntexinfo_documents = [\n    (master_doc, 'Vyper', 'Vyper Documentation',\n     author, 'Vyper', 'One line description of project.',\n     'Miscellaneous'),\n]\n\nsource_parsers = {\n    '.md': CommonMarkParser,\n}\n\nsource_suffix = ['.rst', '.md']\n", "path": "docs/conf.py"}], "after_files": [{"content": "#!/usr/bin/env python3\n# -*- coding: utf-8 -*-\n#\n# Vyper documentation build configuration file, created by\n# sphinx-quickstart on Wed Jul 26 11:18:29 2017.\n#\n# This file is execfile()d with the current directory set to its\n# containing dir.\n#\n# Note that not all possible configuration values are present in this\n# autogenerated file.\n#\n# All configuration values have a default; values that are commented out\n# serve to show the default.\n\n# If extensions (or modules to document with autodoc) are in another directory,\n# add these directories to sys.path here. If the directory is relative to the\n# documentation root, use os.path.abspath to make it absolute, like shown here.\n#\n# import os\n# import sys\n# sys.path.insert(0, os.path.abspath('.'))\nfrom recommonmark.parser import CommonMarkParser\n\n# TO DO - Create and Implement Vyper Lexer\n# def setup(sphinx):\n#     sys.path.insert(0, os.path.abspath('./utils'))\n#     from SolidityLexer import SolidityLexer\n#     sphinx.add_lexer('Python', SolidityLexer())\n\n\n# -- General configuration ------------------------------------------------\n\n# If your documentation needs a minimal Sphinx version, state it here.\n#\n# needs_sphinx = '1.0'\n\n# Add any Sphinx extension module names here, as strings. They can be\n# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom\n# ones.\nextensions = [\n    'sphinx.ext.autodoc'\n]\n\n# Add any paths that contain templates here, relative to this directory.\ntemplates_path = ['_templates']\n\n# The suffix(es) of source filenames.\n# You can specify multiple suffix as a list of string:\n#\n# source_suffix = ['.rst', '.md']\nsource_suffix = '.rst'\n\n# The master toctree document.\nmaster_doc = 'index'\n\n# General information about the project.\nproject = 'Vyper'\ncopyright = '2017, Vitalik Buterin'\nauthor = 'Vitalik Buterin'\n\n# The version info for the project you're documenting, acts as replacement for\n# |version| and |release|, also used in various other places throughout the\n# built documents.\n#\n# The short X.Y version.\nversion = ''\n# The full version, including alpha/beta/rc tags.\nrelease = ''\n\n# The language for content autogenerated by Sphinx. Refer to documentation\n# for a list of supported languages.\n#\n# This is also used if you do content translation via gettext catalogs.\n# Usually you set \"language\" from the command line for these cases.\nlanguage = 'python'\n\n# List of patterns, relative to source directory, that match files and\n# directories to ignore when looking for source files.\n# This patterns also effect to html_static_path and html_extra_path\nexclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']\n\n# The name of the Pygments (syntax highlighting) style to use.\npygments_style = 'sphinx'\n\n# If true, `todo` and `todoList` produce output, else they produce nothing.\ntodo_include_todos = False\n\n\n# -- Options for HTML output ----------------------------------------------\n\n# The theme to use for HTML and HTML Help pages.  See the documentation for\n# a list of builtin themes.\n#\nhtml_theme = \"sphinx_rtd_theme\"\n\n# Theme options are theme-specific and customize the look and feel of a theme\n# further.  For a list of options available for each theme, see the\n# documentation.\n#\n# html_theme_options = {}\n\n# Add any paths that contain custom static files (such as style sheets) here,\n# relative to this directory. They are copied after the builtin static files,\n# so a file named \"default.css\" will overwrite the builtin \"default.css\".\n# html_static_path = ['_static']\n\n# Custom sidebar templates, must be a dictionary that maps document names\n# to template names.\n#\n# This is required for the alabaster theme\n# refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars\nhtml_sidebars = {\n    '**': [\n        'about.html',\n        'navigation.html',\n        'relations.html',  # needs 'show_related': True theme option to display\n        'searchbox.html',\n        'donate.html',\n    ]\n}\n\n\n# -- Options for HTMLHelp output ------------------------------------------\n\n# Output file base name for HTML help builder.\nhtmlhelp_basename = 'Vyperdoc'\n\n\n# -- Options for LaTeX output ---------------------------------------------\n\nlatex_elements = {\n    # The paper size ('letterpaper' or 'a4paper').\n    #\n    # 'papersize': 'letterpaper',\n\n    # The font size ('10pt', '11pt' or '12pt').\n    #\n    # 'pointsize': '10pt',\n\n    # Additional stuff for the LaTeX preamble.\n    #\n    # 'preamble': '',\n\n    # Latex figure (float) alignment\n    #\n    # 'figure_align': 'htbp',\n}\n\n# Grouping the document tree into LaTeX files. List of tuples\n# (source start file, target name, title,\n#  author, documentclass [howto, manual, or own class]).\nlatex_documents = [\n    (master_doc, 'Vyper.tex', 'Vyper Documentation',\n     'Vitalik Buterin', 'manual'),\n]\n\n\n# -- Options for manual page output ---------------------------------------\n\n# One entry per manual page. List of tuples\n# (source start file, name, description, authors, manual section).\nman_pages = [\n    (master_doc, 'vyper', 'Vyper Documentation',\n     [author], 1)\n]\n\n\n# -- Options for Texinfo output -------------------------------------------\n\n# Grouping the document tree into Texinfo files. List of tuples\n# (source start file, target name, title, author,\n#  dir menu entry, description, category)\ntexinfo_documents = [\n    (master_doc, 'Vyper', 'Vyper Documentation',\n     author, 'Vyper', 'One line description of project.',\n     'Miscellaneous'),\n]\n\nsource_parsers = {\n    '.md': CommonMarkParser,\n}\n\nsource_suffix = ['.rst', '.md']\n", "path": "docs/conf.py"}]}