[Sema] Diagnose availability via TypeReprs rather than Types. #6036
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The code that diagnosed availability for types was reverse-engineering the Type itself, rather than making use of the declaration already stored within the TypeRepr. More importantly, it would completely skip nested types, so it would fail to diagnose a deprecated/unavailable “Bar” in “Foo.Bar”. Replace the type-inspecting check with a much-simpler walk over the components of the IdentTypeRepr that looks at the declarations stored in the IdentTypeRepr directly. This provides proper source-location information and handles nested types. This is a source-breaking change for ill-formed Swift 3 code that used nested type references to refer to something that should be unavailable. Given that such Swift 3 code was ill-formed, and most uses of it would crash at runtime, we likely do not need to provide specific logic to address this in Swift 3 compatibility mode.
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@swift-ci please smoke test and merge |
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The code that diagnosed availability for types was reverse-engineering
the Type itself, rather than making use of the declaration already
stored within the TypeRepr.
More importantly, it would completely skip nested types, so it would
fail to diagnose a deprecated/unavailable “Bar” in “Foo.Bar”.
Replace the type-inspecting check with a much-simpler walk over the
components of the IdentTypeRepr that looks at the declarations stored
in the IdentTypeRepr directly. This provides proper source-location
information and handles nested types.
This is a source-breaking change for ill-formed Swift 3 code that used
nested type references to refer to something that should be unavailable.
Given that such Swift 3 code was ill-formed, and most uses of it would
crash at runtime, we likely do not need to provide specific logic to
address this in Swift 3 compatibility mode.