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## Summary This PR reworks `TypeInferenceBuilder::infer_type_expression()` so that we emit diagnostics when encountering a list literal in a type expression. The only place where a list literal is allowed in a type expression is if it appears as the first argument to `Callable[]`, and `Callable` is already heavily special-cased in our type-expression parsing. In order to ensure that list literals are _always_ allowed as the _first_ argument to `Callabler` (but never allowed as the second, third, etc. argument), I had to do some refactoring of our type-expression parsing for `Callable` annotations. ## Test Plan New mdtests added, and existing ones updated |
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| .. | ||
| annotated.md | ||
| any.md | ||
| callable.md | ||
| deferred.md | ||
| int_float_complex.md | ||
| invalid.md | ||
| literal.md | ||
| literal_string.md | ||
| never.md | ||
| optional.md | ||
| starred.md | ||
| stdlib_typing_aliases.md | ||
| string.md | ||
| union.md | ||
| unsupported_special_forms.md | ||
| unsupported_type_qualifiers.md | ||