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Align more error messages with CPython 3.14.5 by ShaharNaveh · Pull Request #7933 · RustPython/RustPython · GitHub

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Align more error messages with CPython 3.14.5 - #7933

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youknowone merged 4 commits into
RustPython:mainfrom
ShaharNaveh:ruff-error-msg-0
May 20, 2026
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Align more error messages with CPython 3.14.5#7933
youknowone merged 4 commits into
RustPython:mainfrom
ShaharNaveh:ruff-error-msg-0

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ShaharNaveh commented May 20, 2026 •
edited by coderabbitai Bot
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Summary by CodeRabbit

  • Bug Fixes
    • Improved syntax error messages with precise location details, including line numbers for unterminated string literals
    • Added clearer error when arguments appear after var-keyword parameters
    • Refined wording and formatting for several other syntax errors and made "expected …" messages more specific

github-actions Bot commented May 20, 2026 •
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📦 Library Dependencies

The following Lib/ modules were modified. Here are their dependencies:

[ ] test: cpython/Lib/test/test_syntax.py (TODO: 253)

dependencies:

dependent tests: (no tests depend on syntax)

[x] test: cpython/Lib/test/test_eof.py (TODO: 5)

dependencies:

dependent tests: (no tests depend on eof)

Legend:

  • [+] path exists in CPython
  • [x] up-to-date, [ ] outdated

coderabbitai Bot commented May 20, 2026 •
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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info ⚙️ Run configuration

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Pro

Run ID: 66d7efa8-706f-4ab1-beba-2d3668aef16d

📥 Commits

Reviewing files that changed from the base of the PR and between f3abe06 and c17af96.

⛔ Files ignored due to path filters (2)
  • Lib/test/test_eof.py is excluded by !Lib/**
  • Lib/test/test_syntax.py is excluded by !Lib/**
📒 Files selected for processing (1)
  • crates/vm/src/vm/vm_new.rs
📝 Walkthrough

Walkthrough

Error message handling in analyze_compile_error is enhanced to capture error location and improve parse error messages. The CompileError::Parse destructuring now binds location to enable precise error reporting. Subsequent error types receive updated messages: unterminated strings include detected line numbers, a new ParamAfterVarKeywordParam case is added, and multiple OtherError cases are rewritten with improved or raw-string formatting.

Changes

Parse Error Message Handling

Layer / File(s) Summary
Parse error location binding
crates/vm/src/vm/vm_new.rs		 CompileError::Parse pattern destructuring is updated to bind location for use in downstream error-message formatting.
Error-type-specific message updates
crates/vm/src/vm/vm_new.rs		 Unterminated string errors now report detected line numbers, a new ParamAfterVarKeywordParam case is added with its message, and multiple OtherError string-match cases are rewritten with improved or raw-string formatting.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

Suggested reviewers

  • youknowone

Poem

🐰 A compiler speaks clearer with location in sight,
Each parse error now tells where things went not right,
With line numbers glowing and messages refined,
The rabbit hops forward—no ambiguity in mind!

🚥 Pre-merge checks | ✅ 5 ✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and specifically describes the main change: aligning error messages with CPython 3.14.5, which matches the error message updates throughout the vm_new.rs file.
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.

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ShaharNaveh marked this pull request as draft May 20, 2026 09:44
ShaharNaveh marked this pull request as ready for review May 20, 2026 10:59
youknowone approved these changes May 20, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

👍

youknowone merged commit ee006af into RustPython:main May 20, 2026
27 checks passed
coderabbitai Bot mentioned this pull request May 27, 2026
Merged
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request May 29, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
4383c21 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
JamesClarke7283 mentioned this pull request May 29, 2026
Open
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request May 29, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
a84b1a4 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request May 30, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
5b93cce 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request May 30, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
71003be 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request Jun 3, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
be45903 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request Aug 16, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
0b5c367 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request Aug 16, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
cee2808 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
JamesClarke7283 added a commit to JamesClarke7283/RustPython that referenced this pull request Aug 19, 2026
Align more parser/SyntaxError messages with CPython 3.14.5
d56469a 
Continues RustPython#7928/RustPython#7933/RustPython#7988. Translates many more ruff ParseErrorType
variants to CPython's exact wording in CompileError::from_ruff_parse_error,
and routes ast.parse() / compile(PyCF_ONLY_AST) through the same path so
those messages match too (previously they leaked raw ruff strings). Adds a
few codegen/symtable checks.

Covered: aug-assign/delete/set/dict/f-string/t-string targets; "cannot use
{kind} as import target"; string-prefix incompatibility and "invalid
character 'X' (U+XXXX)"; parenthesized def/lambda params; missing
default/argument value; dict ':' / value syntax; "'elif' block follows an
'else' block"; raise-from; comprehension 'if'; ternary statement keywords;
match "case ... as <target>" -> "cannot use {kind} as pattern target" and
"case ... as _"; __debug__ as def/class/type-param/except name; "name 'x'
is nonlocal and global"; generic type-parameter wording.

Lib/test: drop the now-passing "# TODO: RUSTPYTHON; Wrong error message"
doctest markers and @expectedfailure decorators.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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