[SR-14660] Swift Compiler Crashes When Compiling Extensions to Optional #57012
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Triggers an assertion on Assertion failed: (resultTy.getASTType().getOptionalObjectType() && "input was not a nested optional value"), function flattenOptional, file SILGenExpr.cpp, line 3928. extension Optional where Wrapped: BinaryInteger {
init?<T>(_ value: Optional<T>) where T: BinaryFloatingPoint {
return nil
}
}
extension Optional where Wrapped: BinaryFloatingPoint {
init?<T>(_ value: Optional<T>) where T: BinaryInteger {
self.init(Wrapped(value!))
}
} |
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@swift-ci create |
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Reduced: extension Optional {
init?(x: Bool) {
self.init(x: x)
}
} |
AnthonyLatsis
added
the
crash
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Attachment: Download
Environment
macOS 11.4 (20F71)
Xcode 12.5 (12E262)
Swift 5.4 (swiftlang-1205.0.26.9 clang-1205.0.19.55)
Additional Detail from JIRA
md5: 511faf1769264cce28ba907b89fbd44b
Issue Description:
I'm trying to extend Swift's Optional type to add constructors that take Optionals associated with other types so I don't have to guard multiple times when converting between primitive types. I simply expect the whole statement to cascade to nil if it encounters nil anywhere or the constructor fails.
Anyway, I wrote the following code (included in the reproducible):
Whatever project I put this file into, it crashes Swift compiler with Segmentation fault: 11; and Xcode stops helping me work due to internal error.
I put it in a blank iOS project and uploaded a reproducible.
P.S.: I'm not 100% sure the code above should compile since I've got no way to know now.
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