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b5759c9fd9
Allow an 'async' function to overload a non-'async' one, e.g.,
func performOperation(_: String) throws -> String { ... }
func performOperation(_: String) async throws -> String { ... }
Extend the scoring system in the type checker to penalize cases where
code in an asynchronous context (e.g., an `async` function or closure)
references an asychronous declaration or vice-versa, so that
asynchronous code prefers the 'async' functions and synchronous code
prefers the non-'async' functions. This allows the above overloading
to be a legitimate approach to introducing asynchronous functionality
to existing (blocking) APIs and letting code migrate over.
47 lines
1.4 KiB
Swift
47 lines
1.4 KiB
Swift
// RUN: %target-typecheck-verify-swift -parse-stdlib -debug-constraints > %t.log 2>&1
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// RUN: %FileCheck %s < %t.log
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import Swift
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func takeDoubleAndBool(_: Double, _: Bool) { }
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func testTernaryOneWay(b: Bool, b2: Bool) {
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// CHECK: ---Connected components---
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// CHECK-NEXT: 3: $T10 depends on 1
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// CHECK-NEXT: 1: $T5 $T8 $T9 depends on 0, 2
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// CHECK-NEXT: 2: $T7
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// CHECK-NEXT: 0: $T4
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// CHECK-NEXT: 4: $T11 $T13 $T14
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takeDoubleAndBool(
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Builtin.one_way(
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b ? Builtin.one_way(3.14159) : Builtin.one_way(2.71828)),
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b == true)
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}
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func int8Or16(_ x: Int8) -> Int8 { return x }
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func int8Or16(_ x: Int16) -> Int16 { return x }
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func testTernaryOneWayOverload(b: Bool) {
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// CHECK: ---Connected components---
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// CHECK: 1: $T5 $T10 $T11 depends on 0, 2
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// CHECK: 2: $T7 $T8 $T9
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// CHECK: 0: $T2 $T3 $T4
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// CHECK: solving component #1
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// CHECK: Initial bindings: $T11 := Int16, $T11 := Int8
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// CHECK: solving component #1
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// CHECK: Initial bindings: $T11 := Int16, $T11 := Int8
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// CHECK: solving component #1
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// CHECK: Initial bindings: $T11 := Int8, $T11 := Int16
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// CHECK: solving component #1
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// CHECK: Initial bindings: $T11 := Int8
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// CHECK: found solution {{.*}} 2 0 0 0 0 0
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// CHECK: composed solution {{.*}} 2 0 0 0 0 0
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// CHECK-NOT: composed solution {{.*}} 2 0 0 0 0 0
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let _: Int8 = b ? Builtin.one_way(int8Or16(17)) : Builtin.one_way(int8Or16(42))
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}
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