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## Summary This PR improves the `is_safe_mutable_class` function in `infer.rs` in several ways: - It uses `KnownClass::to_instance()` for all "safe mutable classes". Previously, we were using `SpecialFormType::instance_fallback()` for some variants -- I'm not totally sure why. Switching to `KnownClass::to_instance()` for all "safe mutable classes" fixes a number of TODOs in the `assignment.md` mdtest suite - Rather than eagerly calling `.to_instance(db)` on all "safe mutable classes" every time `is_safe_mutable_class` is called, we now only call it lazily on each element, allowing us to short-circuit more effectively. - I removed the entry entirely for `TypedDict` from the list of "safe mutable classes", as it's not correct. `SpecialFormType::TypedDict.instance_fallback(db)` just returns an instance type representing "any instance of `typing._SpecialForm`", which I don't think was the intent of this code. No tests fail as a result of removing this entry, as we already check separately whether an object is an inhabitant of a `TypedDict` type (and consider that object safe-mutable if so!). ## Test Plan mdtests updated |
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| .. | ||
| annotations | ||
| assignment | ||
| binary | ||
| boolean | ||
| boundness_declaredness | ||
| call | ||
| class | ||
| comparison | ||
| comprehensions | ||
| conditional | ||
| dataclasses | ||
| declaration | ||
| diagnostics | ||
| directives | ||
| doc | ||
| exception | ||
| expression | ||
| function | ||
| generics | ||
| ide_support | ||
| import | ||
| literal | ||
| loops | ||
| narrow | ||
| regression | ||
| scopes | ||
| shadowing | ||
| snapshots | ||
| stubs | ||
| subscript | ||
| suppressions | ||
| type_compendium | ||
| type_of | ||
| type_properties | ||
| type_qualifiers | ||
| unary | ||
| with | ||
| .mdformat.toml | ||
| async.md | ||
| attributes.md | ||
| cycle.md | ||
| decorators.md | ||
| del.md | ||
| deprecated.md | ||
| descriptor_protocol.md | ||
| enums.md | ||
| exhaustiveness_checking.md | ||
| final.md | ||
| instance_layout_conflict.md | ||
| intersection_types.md | ||
| invalid_syntax.md | ||
| known_constants.md | ||
| mdtest_config.md | ||
| mdtest_custom_typeshed.md | ||
| metaclass.md | ||
| mro.md | ||
| named_tuple.md | ||
| overloads.md | ||
| pep695_type_aliases.md | ||
| properties.md | ||
| protocols.md | ||
| public_types.md | ||
| statically_known_branches.md | ||
| sys_platform.md | ||
| sys_version_info.md | ||
| terminal_statements.md | ||
| ty_extensions.md | ||
| typed_dict.md | ||
| union_types.md | ||
| unpacking.md | ||
| unreachable.md | ||