[5.9][CSSyntaticElement] Desugar types before collecting "in scope" type v… #65049
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…ariables Generic type aliases, unless desugared, could bring unrelated type variables into the scope i.e. `TypeAlias<$T, $U>.Context` is actually `_Context<$U>`. These variables could be inferrable only after the the body the closure is solved. To avoid that, let's adjust `TypeVariableRefFinder` to desugar types before collecting referenced type variables. Resolves: rdar://107835060 (cherry picked from commit ca14ab7)
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@swift-ci please test |
hborla
approved these changes
Apr 11, 2023
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…ariables
Cherry-pick of #65048
Generic type aliases, unless desugared, could bring unrelated type variables into the scope i.e.
TypeAlias<$T, $U>.Contextis actually_Context<$U>. These variables could be inferrable only after the the body the closure is solved. To avoid that, let's adjustTypeVariableRefFinderto desugar types before collecting referenced type variables.Scope: Calls with multi-statement closures that get contextual parameters/result types that use generic type aliases.
Main Branch PR: [CSSyntaticElement] Desugar types before collecting "in scope" type v… #65048
Resolves: rdar://107835060
Risk: Low
Reviewed By: @hborla
Testing: Added a regression test-case to the suite.
Resolves: rdar://107835060
(cherry picked from commit ca14ab7)