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70cfa6a05c
As an optimization, there is a fast-cast to non-final classes that just compares isa pointers. If the source of the cast is an Optional<class>, though, it's not allowed to "directly compare the isa-pointer"; because the source might be Optional.none, i.e. null. Add a check for nil when emitting the fast class cast. rdar://108614878
25 lines
395 B
Swift
25 lines
395 B
Swift
// RUN: %target-run-simple-swift | %FileCheck %s
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// REQUIRES: executable_test
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final class C {}
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struct S {
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@inline(never)
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func g1<T>(_ componentType: T.Type) -> T? {
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return nil
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}
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@inline(never)
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func g2<T>(_ type: T.Type) -> T? {
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g1(T.self) as? T
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}
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}
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func run() -> C? {
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var e = S()
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let r = e.g2(C.self)
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return r
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}
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// CHECK: nil
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print(run())
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