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fa474ee750
conversions. We limit the relationship between the result of the conversion and the actual expected type to a subtyping relationship, which effectively limits us to applying a single user-defined conversion function (rather than a chain of such conversions). Later, we can consider extending this to a chain of conversion functions, but that will require us to cope with cyclic conversions and minimizing conversion sequences (e.g., if A -> B -> C and A -> C are both possible, we should prefer A -> C). Swift SVN r2730
71 lines
1.4 KiB
Swift
71 lines
1.4 KiB
Swift
// RUN: %swift -repl < %s 2>&1 | FileCheck %s
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struct Y { }
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class A {
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func [conversion] __conversion() -> Y {}
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}
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class B : A { }
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struct X {
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func [conversion] __conversion() -> B {}
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}
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func fb(_ : B) {}
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func fa(_ : A) {}
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func fy(_ : Y) {}
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var a : A
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var b : B
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var x : X
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// CHECK: Constraints:
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// CHECK: B -> () == $T0 -> $T1
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// CHECK: [byref(heap)] X << $T0
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// CHECK: Type Variables:
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// CHECK: $T0 as B
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// CHECK: $T1 as ()
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// CHECK: $T2 as ()
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// CHECK: $T3 as B
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// CHECK: SOLVED (completely)
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// CHECK: Unique solution found.
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:dump_constraints fb(x)
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// CHECK: Constraints:
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// CHECK: A -> () == $T0 -> $T1
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// CHECK: [byref(heap)] X << $T0
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// CHECK: Type Variables:
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// CHECK: $T0 as A
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// CHECK: $T1 as ()
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// CHECK: $T2 as ()
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// CHECK: $T3 as B
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// CHECK: SOLVED (completely)
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// CHECK: Unique solution found.
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:dump_constraints fa(x)
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// CHECK: Constraints:
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// CHECK: Y -> () == $T0 -> $T1
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// CHECK: [byref(heap)] B << $T0
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// CHECK: Type Variables:
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// CHECK: $T0 as Y
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// CHECK: $T1 as ()
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// CHECK: $T2 as ()
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// CHECK: $T3 as Y
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// CHECK: SOLVED (completely)
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// CHECK: Unique solution found.
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:dump_constraints fy(b)
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// CHECK: Constraints:
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// CHECK: Y -> () == $T0 -> $T1
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// CHECK: [byref(heap)] X << $T0
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// CHECK: Type Variables:
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// CHECK: $T0 as Y
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// CHECK: $T1 as ()
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// CHECK: $T2 as ()
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// CHECK: $T3 as B
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// CHECK: UNSOLVED
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// CHECK: No solution found.
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:dump_constraints fy(x)
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