[Property wrappers] Fix source compatibility issue with attribute lookup #27645
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…kup. Swift 5.1's lookup for custom attributes skipped associated type members, which allowed code like the given example to compile. To maintain source compatibility, identify the narrow case that happens in practice---the property wrapper is at module scope but is now shadowed by an associated type---warn about it, and accept it. Fixes rdar://problem/56213175.
DougGregor
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@swift-ci please smoke test and merge |
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@swift-ci please smoke test macOS |
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Swift 5.1's lookup for custom attributes skipped associated type
members, which allowed code like the given example to compile. To
maintain source compatibility, identify the narrow case that happens
in practice---the property wrapper is at module scope but is now
shadowed by an associated type---warn about it, and accept it.
Fixes rdar://problem/56213175.