{"schema_version":"4.0","kind":"technical_task_solution","page":{"title":"How do you fix Sphinx parse_declaration to accept C++ template declarations without sphinx.util.cfamily.DefinitionError?","url":"https://agent-solution.dev/tasks/sphinx-doc-util-cfamily-definitionerror-parse-declaration","manifest_url":"https://agent-solution.dev/tasks/sphinx-doc-util-cfamily-definitionerror-parse-declaration/agent.json","description":"sphinx-doc/sphinx — sphinx.util.cfamily.DefinitionError in parse_declaration. Traceback path: sphinx/domains/cpp.py.","updated_at":"2026-08-27"},"task_match":{"technology":"sphinx-doc/sphinx","error_signature":"sphinx.util.cfamily.DefinitionError","focus_symbol":"parse_declaration","focus_path":"sphinx/domains/cpp.py","problem_class":"python-traceback-repairs","statement_kind":"verbatim agent-facing issue statement","task_statement":"sphinx.util.cfamily.DefinitionError: Error in template parameter list.\n**Describe the bug**\r\nI appear to have some valid C++14 syntax which causes Sphinx's C++ parser to choke. Here is the full error trace:\r\n\r\n```\r\n# Sphinx version: 3.1.2\r\n# Python version: 3.7.4 (CPython)\r\n# Docutils version: 0.16 release\r\n# Jinja2 version: 2.11.2\r\n# Last messages:\r\n#   reading sources... [ 36%] api/function_namespacec10_1_1detail_1a0ae4a0b76b5203a055ad8e184734a642\r\n#   reading sources... [ 36%] api/function_namespacec10_1_1detail_1a38bac4f70cbe3e60b11e84a4af793018\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1a63a885be061e64e85482d1bc657d9eab\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1a7fd879319c4690483b10f7377cdc0c14\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1aa26558d64e565f26516bd99850b6df8f\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1aba4bf15cd6c6b43bb04a70f67dd5dd98\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1ae289a3f407b2fe02ae5012a59b453f8f\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1af0966c5849fbf09f16675056a0bd7bda\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1af8326a119322305e6244a45e6acd2ecc\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail___1a8657ebe87695069950896d52bf3504ca\r\n# Loaded extensions:\r\n#   sphinx.ext.mathjax (3.1.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/ext/mathjax.py\r\n#   sphinxcontrib.applehelp (1.0.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/applehelp/__init__.py\r\n#   sphinxcontrib.devhelp (1.0.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/devhelp/__init__.py\r\n#   sphinxcontrib.htmlhelp (1.0.3) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/htmlhelp/__init__.py\r\n#   sphinxcontrib.serializinghtml (1.1.4) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/serializinghtml/__init__.py\r\n#   sphinxcontrib.qthelp (1.0.3) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/qthelp/__init__.py\r\n#   alabaster (0.7.12) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/alabaster/__init__.py\r\n#   sphinx.ext.intersphinx (3.1.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/ext/intersphinx.py\r\n#   breathe (4.19.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/__init__.py\r\n#   exhale (0.2.3) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/exhale/__init__.py\r\n#   pytorch_sphinx_theme (unknown version) from /Users/ezyang/Dev/pytorch-tmp/docs/cpp/src/pytorch-sphinx-theme/pytorch_sphinx_theme/__init__.py\r\nTraceback (most recent call last):\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/cmd/build.py\", line 280, in build_main\r\n    app.build(args.force_all, filenames)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/application.py\", line 348, in build\r\n    self.builder.build_update()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 299, in build_update\r\n    len(to_build))\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 311, in build\r\n    updated_docnames = set(self.read())\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 418, in read\r\n    self._read_serial(docnames)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 439, in _read_serial\r\n    self.read_doc(docname)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 479, in read_doc\r\n    doctree = read_doc(self.app, self.env, self.env.doc2path(docname))\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/io.py\", line 221, in read_doc\r\n    pub.publish()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/core.py\", line 218, in publish\r\n    self.settings)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/io.py\", line 126, in read\r\n    self.parse()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/readers/__init__.py\", line 77, in parse\r\n    self.parser.parse(self.input, document)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/parsers.py\", line 102, in parse\r\n    self.statemachine.run(inputlines, document, inliner=self.inliner)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 171, in run\r\n    input_source=document['source'])\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 242, in run\r\n    context, state, transitions)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 459, in check_line\r\n    return method(match, context, next_state)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2769, in underline\r\n    self.section(title, source, style, lineno - 1, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 327, in section\r\n    self.new_subsection(title, lineno, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 395, in new_subsection\r\n    node=section_node, match_titles=True)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 282, in nested_parse\r\n    node=node, match_titles=match_titles)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 196, in run\r\n    results = StateMachineWS.run(self, input_lines, input_offset)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 242, in run\r\n    context, state, transitions)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 459, in check_line\r\n    return method(match, context, next_state)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2769, in underline\r\n    self.section(title, source, style, lineno - 1, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 327, in section\r\n    self.new_subsection(title, lineno, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 395, in new_subsection\r\n    node=section_node, match_titles=True)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 282, in nested_parse\r\n    node=node, match_titles=match_titles)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 196, in run\r\n    results = StateMachineWS.run(self, input_lines, input_offset)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 242, in run\r\n    context, state, transitions)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 459, in check_line\r\n    return method(match, context, next_state)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2342, in explicit_markup\r\n    nodelist, blank_finish = self.explicit_construct(match)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2354, in explicit_construct\r\n    return method(self, expmatch)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2097, in directive\r\n    directive_class, match, type_name, option_presets)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2146, in run_directive\r\n    result = directive_instance.run()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/directives.py\", line 99, in run\r\n    node_stack = self.resolve_function(matches, args, project_info)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/directives.py\", line 239, in resolve_function\r\n    mask_factory, directive_args)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/directives.py\", line 212, in create_function_signature\r\n    ast = parser.parse_declaration('function', 'function')\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6492, in parse_declaration\r\n    templatePrefix = self._parse_template_declaration_prefix(objectType)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6418, in _parse_template_declaration_prefix\r\n    raise e\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6413, in _parse_template_declaration_prefix\r\n    params = self._parse_template_parameter_list()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6310, in _parse_template_parameter_list\r\n    raise self._make_multi_error(prevErrors, header)\r\nsphinx.util.cfamily.DefinitionError: Error in template parameter list.\r\nInvalid C++ declaration: Expected \"=\", \",\", or \">\". [error at 33]\r\n  template<typename T, typename std::enable_if< !has_overloaded_addressof< T > ::value, bool >::type = false> constexpr T * static_addressof (T &ref)\r\n  ---------------------------------^\r\n```\r\n\r\n**To Reproduce**\r\nSteps to reproduce the behavior:\r\n```\r\n$ git clone https://github.com/ezyang/pytorch -b poc/sphinx-failure\r\n$ cd pytorch/docs/cpp\r\n$ pip install -r requirements.txt\r\n$ make html\r\n```\r\n\r\n**Expected behavior**\r\nBuild should succeed","technical_objective":"Extend Sphinx's C++ domain declaration parser so that the C++ construct shown in the report parses successfully, letting documentation builds containing such declarations complete.","success_condition":"the declaration quoted in the error footer is accepted by the C++ domain parser and renders as a function declaration, the build no longer aborts with sphinx.util.cfamily.DefinitionError: Error in template parameter list., and the parser's existing accept/reject behaviour for all currently-handled C++ declarations is preserved (including still rejecting genuinely invalid declarations).","upstream_source":{"repository":"sphinx-doc/sphinx","commit":"0cfb433b25c085071ea46c3ecf8e84f17228643f","version":"3.2"},"primary_terms":["sphinx.util.cfamily.DefinitionError","parse_declaration","sphinx/domains/cpp.py","sphinx-doc/sphinx","sphinx.util.cfamily.DefinitionError: Error in template parameter list.","_parse_template_declaration_prefix","_parse_template_parameter_list","create_function_signature","resolve_function","sphinx/util/cfamily.py","sphinx/parsers.py","sphinx/io.py"],"search_signals":["Error signature: sphinx.util.cfamily.DefinitionError","Traceback path: sphinx/domains/cpp.py","Repository: sphinx-doc/sphinx","Issue title: sphinx.util.cfamily.DefinitionError: Error in template parameter list.","Symbols: sphinx.util.cfamily.DefinitionError, parse_declaration, _parse_template_declaration_prefix, _parse_template_parameter_list, create_function_signature, resolve_function.","Files: sphinx/domains/cpp.py, sphinx/util/cfamily.py, sphinx/parsers.py, sphinx/io.py, breathe/directives.py.","Verbatim error strings: Error in template parameter list., Invalid C++ declaration: Expected \"=\", \",\", or \">\". [error at 33].","Failing declaration: template<typename T, typename std::enable_if< !has_overloaded_addressof< T > ::value, bool >::type = false> constexpr T * static_addressof (T &ref).","Reproduction: git clone https://github.com/ezyang/pytorch -b poc/sphinx-failure, cd pytorch/docs/cpp, pip install -r requirements.txt, make html.","Versions quoted in the report: Sphinx 3.1.2, Python 3.7.4 (CPython), Docutils 0.16, Jinja2 2.11.2, breathe 4.19.2, exhale 0.2.3, pytorch_sphinx_theme.","Technologies: C++14 SFINAE, std::enable_if, has_overloaded_addressof, static_addressof, Doxygen/breathe."],"match_summary":"Matches sphinx-doc/sphinx work keyed on sphinx.util.cfamily.DefinitionError in parse_declaration.","demonstrations":null},"evidence_search":{"guide_url":"https://agent-solution.dev/tasks/sphinx-doc-util-cfamily-definitionerror-parse-declaration/llms.txt","method":"GET","url":"https://agent-solution.dev/tasks/sphinx-doc-util-cfamily-definitionerror-parse-declaration/search","url_template":"https://agent-solution.dev/tasks/sphinx-doc-util-cfamily-definitionerror-parse-declaration/search?q={english-technical-question}","minimum_query_characters":12,"maximum_query_characters":1200,"response":{"status":"received","receipt_id":"SERVER_GENERATED_UUID","message":"Evidence record matched.","evidence_record":{"title":"How do you fix Sphinx parse_declaration to accept C++ template declarations without sphinx.util.cfamily.DefinitionError?","summary":"Matches sphinx-doc/sphinx work keyed on sphinx.util.cfamily.DefinitionError in parse_declaration.","task_statement":"sphinx.util.cfamily.DefinitionError: Error in template parameter list.\n**Describe the bug**\r\nI appear to have some valid C++14 syntax which causes Sphinx's C++ parser to choke. Here is the full error trace:\r\n\r\n```\r\n# Sphinx version: 3.1.2\r\n# Python version: 3.7.4 (CPython)\r\n# Docutils version: 0.16 release\r\n# Jinja2 version: 2.11.2\r\n# Last messages:\r\n#   reading sources... [ 36%] api/function_namespacec10_1_1detail_1a0ae4a0b76b5203a055ad8e184734a642\r\n#   reading sources... [ 36%] api/function_namespacec10_1_1detail_1a38bac4f70cbe3e60b11e84a4af793018\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1a63a885be061e64e85482d1bc657d9eab\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1a7fd879319c4690483b10f7377cdc0c14\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1aa26558d64e565f26516bd99850b6df8f\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1aba4bf15cd6c6b43bb04a70f67dd5dd98\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1ae289a3f407b2fe02ae5012a59b453f8f\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1af0966c5849fbf09f16675056a0bd7bda\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail_1af8326a119322305e6244a45e6acd2ecc\r\n#   reading sources... [ 37%] api/function_namespacec10_1_1detail___1a8657ebe87695069950896d52bf3504ca\r\n# Loaded extensions:\r\n#   sphinx.ext.mathjax (3.1.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/ext/mathjax.py\r\n#   sphinxcontrib.applehelp (1.0.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/applehelp/__init__.py\r\n#   sphinxcontrib.devhelp (1.0.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/devhelp/__init__.py\r\n#   sphinxcontrib.htmlhelp (1.0.3) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/htmlhelp/__init__.py\r\n#   sphinxcontrib.serializinghtml (1.1.4) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/serializinghtml/__init__.py\r\n#   sphinxcontrib.qthelp (1.0.3) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinxcontrib/qthelp/__init__.py\r\n#   alabaster (0.7.12) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/alabaster/__init__.py\r\n#   sphinx.ext.intersphinx (3.1.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/ext/intersphinx.py\r\n#   breathe (4.19.2) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/__init__.py\r\n#   exhale (0.2.3) from /Users/ezyang/miniconda3/lib/python3.7/site-packages/exhale/__init__.py\r\n#   pytorch_sphinx_theme (unknown version) from /Users/ezyang/Dev/pytorch-tmp/docs/cpp/src/pytorch-sphinx-theme/pytorch_sphinx_theme/__init__.py\r\nTraceback (most recent call last):\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/cmd/build.py\", line 280, in build_main\r\n    app.build(args.force_all, filenames)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/application.py\", line 348, in build\r\n    self.builder.build_update()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 299, in build_update\r\n    len(to_build))\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 311, in build\r\n    updated_docnames = set(self.read())\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 418, in read\r\n    self._read_serial(docnames)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 439, in _read_serial\r\n    self.read_doc(docname)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/builders/__init__.py\", line 479, in read_doc\r\n    doctree = read_doc(self.app, self.env, self.env.doc2path(docname))\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/io.py\", line 221, in read_doc\r\n    pub.publish()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/core.py\", line 218, in publish\r\n    self.settings)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/io.py\", line 126, in read\r\n    self.parse()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/readers/__init__.py\", line 77, in parse\r\n    self.parser.parse(self.input, document)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/parsers.py\", line 102, in parse\r\n    self.statemachine.run(inputlines, document, inliner=self.inliner)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 171, in run\r\n    input_source=document['source'])\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 242, in run\r\n    context, state, transitions)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 459, in check_line\r\n    return method(match, context, next_state)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2769, in underline\r\n    self.section(title, source, style, lineno - 1, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 327, in section\r\n    self.new_subsection(title, lineno, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 395, in new_subsection\r\n    node=section_node, match_titles=True)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 282, in nested_parse\r\n    node=node, match_titles=match_titles)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 196, in run\r\n    results = StateMachineWS.run(self, input_lines, input_offset)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 242, in run\r\n    context, state, transitions)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 459, in check_line\r\n    return method(match, context, next_state)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2769, in underline\r\n    self.section(title, source, style, lineno - 1, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 327, in section\r\n    self.new_subsection(title, lineno, messages)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 395, in new_subsection\r\n    node=section_node, match_titles=True)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 282, in nested_parse\r\n    node=node, match_titles=match_titles)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 196, in run\r\n    results = StateMachineWS.run(self, input_lines, input_offset)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 242, in run\r\n    context, state, transitions)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/statemachine.py\", line 459, in check_line\r\n    return method(match, context, next_state)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2342, in explicit_markup\r\n    nodelist, blank_finish = self.explicit_construct(match)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2354, in explicit_construct\r\n    return method(self, expmatch)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2097, in directive\r\n    directive_class, match, type_name, option_presets)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/docutils/parsers/rst/states.py\", line 2146, in run_directive\r\n    result = directive_instance.run()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/directives.py\", line 99, in run\r\n    node_stack = self.resolve_function(matches, args, project_info)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/directives.py\", line 239, in resolve_function\r\n    mask_factory, directive_args)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/breathe/directives.py\", line 212, in create_function_signature\r\n    ast = parser.parse_declaration('function', 'function')\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6492, in parse_declaration\r\n    templatePrefix = self._parse_template_declaration_prefix(objectType)\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6418, in _parse_template_declaration_prefix\r\n    raise e\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6413, in _parse_template_declaration_prefix\r\n    params = self._parse_template_parameter_list()\r\n  File \"/Users/ezyang/miniconda3/lib/python3.7/site-packages/sphinx/domains/cpp.py\", line 6310, in _parse_template_parameter_list\r\n    raise self._make_multi_error(prevErrors, header)\r\nsphinx.util.cfamily.DefinitionError: Error in template parameter list.\r\nInvalid C++ declaration: Expected \"=\", \",\", or \">\". [error at 33]\r\n  template<typename T, typename std::enable_if< !has_overloaded_addressof< T > ::value, bool >::type = false> constexpr T * static_addressof (T &ref)\r\n  ---------------------------------^\r\n```\r\n\r\n**To Reproduce**\r\nSteps to reproduce the behavior:\r\n```\r\n$ git clone https://github.com/ezyang/pytorch -b poc/sphinx-failure\r\n$ cd pytorch/docs/cpp\r\n$ pip install -r requirements.txt\r\n$ make html\r\n```\r\n\r\n**Expected behavior**\r\nBuild should succeed","technical_objective":"Extend Sphinx's C++ domain declaration parser so that the C++ construct shown in the report parses successfully, letting documentation builds containing such declarations complete.","success_criteria":"the declaration quoted in the error footer is accepted by the C++ domain parser and renders as a function declaration, the build no longer aborts with sphinx.util.cfamily.DefinitionError: Error in template parameter list., and the parser's existing accept/reject behaviour for all currently-handled C++ declarations is preserved (including still rejecting genuinely invalid declarations).","primary_terms":["sphinx.util.cfamily.DefinitionError","parse_declaration","sphinx/domains/cpp.py","sphinx-doc/sphinx","sphinx.util.cfamily.DefinitionError: Error in template parameter list.","_parse_template_declaration_prefix","_parse_template_parameter_list","create_function_signature","resolve_function","sphinx/util/cfamily.py","sphinx/parsers.py","sphinx/io.py"],"search_signals":["Error signature: sphinx.util.cfamily.DefinitionError","Traceback path: sphinx/domains/cpp.py","Repository: sphinx-doc/sphinx","Issue title: sphinx.util.cfamily.DefinitionError: Error in template parameter list.","Symbols: sphinx.util.cfamily.DefinitionError, parse_declaration, _parse_template_declaration_prefix, _parse_template_parameter_list, create_function_signature, resolve_function.","Files: sphinx/domains/cpp.py, sphinx/util/cfamily.py, sphinx/parsers.py, sphinx/io.py, breathe/directives.py.","Verbatim error strings: Error in template parameter list., Invalid C++ declaration: Expected \"=\", \",\", or \">\". 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