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The Swift Programming Language
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[SR-14141] Swift 5.4 type alias synthesis breaking change #56520

Open stephencelis opened 3 years ago

stephencelis commented 3 years ago
Previous ID SR-14141
Radar rdar://problem/73985915
Original Reporter @stephencelis
Type Bug
Environment Xcode 12.5 beta
Additional Detail from JIRA | | | |------------------|-----------------| |Votes | 0 | |Component/s | Compiler | |Labels | Bug | |Assignee | None | |Priority | Medium | md5: d4c7ac9126611cf67ac5287b58c27a43

Issue Description:

We had code that defined a type alias in an extension that fails to compile in Xcode 12.5 (beta 1). The fix was simple enough: https://github.com/pointfreeco/swift-composable-architecture/pull/371/files

However, in case this breaking change was unintentional, we wanted to report it.

typesanitizer commented 3 years ago

@swift-ci create