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## Summary We have the ability to defer type inference of some parts of definitions, so as to allow us to create a type that may need to be recursively referenced in those other parts of the definition. We also have the ability to do type inference in a context where all name resolution should be deferred (that is, names should be looked up from all-reachable-definitions rather than from the location of use.) This is used for all annotations in stubs, or if `from __future__ import annotations` is active. Previous to this PR, these two concepts were linked: deferred-inference always implied deferred-name-resolution, though we also supported deferred-name-resolution without deferred-inference, via `DeferredExpressionState`. For the upcoming `typing.TypeAlias` support, I will defer inference of the entire RHS of the alias (so as to support cycles), but that doesn't imply deferred name resolution; at runtime, the RHS of a name annotated as `typing.TypeAlias` is executed eagerly. So this PR fully de-couples the two concepts, instead explicitly setting the `DeferredExpressionState` in those cases where we should defer name resolution. It also fixes a long-standing related bug, where we were deferring name resolution of all names in class bases, if any of the class bases contained a stringified annotation. ## Test Plan Added test that failed before this PR. |
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| .. | ||
| corpus | ||
| mdtest | ||
| primer | ||
| README.md | ||
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.