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[pyflakes] Emit semantic syntax errors in string type definitions as F722 - #27835
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…s `F722` Summary -- As uncovered in #17804, `F722` previously applied only to parse errors and not to semantic syntax errors. More confusingly, we were emitting semantic syntax errors, and even other lint rule errors that correspond to syntax errors, on string type definitions, even when `F722` was disabled. This PR adds a check to `Checker::report_semantic_error` for the semantic model's `in_string_type_definition` flag that converts these semantic errors into regular `F722` diagnostics, when the rule is enabled, and returns without reporting an error when the rule is disabled. Test Plan -- New mdtests covering semantic errors in forward annotations
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August 18, 2026 17:32
MichaReiser
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Aug 18, 2026
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Summary
As uncovered in #17804,
F722previously applied only to parse errors and not to semantic syntaxerrors. More confusingly, we were emitting semantic syntax errors, and even other lint rule errors
that correspond to syntax errors, on string type definitions, even when
F722was disabled.This PR adds a check to
Checker::report_semantic_errorfor the semantic model'sin_string_type_definitionflag that converts these semantic errors into regularF722diagnostics, when the rule is enabled, and returns without reporting an error when the rule is
disabled.
Test Plan
New mdtests covering semantic errors in forward annotations