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// RUN: %target-typecheck-verify-swift -debug-constraints -target %target-swift-5.1-abi-triple 2>%t.err
// RUN: %FileCheck %s < %t.err
protocol P<Output> {
associatedtype Output
}
struct S<Output> : P {
init(_: Output) {}
}
@resultBuilder
struct Builder {
static func buildExpression<T>(_ e: T) -> T { e }
static func buildBlock<T1>(_ t1: T1) -> some P<T1> {
return S(t1)
}
static func buildBlock<T1, T2>(_ t1: T1, _ t2: T2) -> some P<(T1, T2)> {
return S((t1, t2))
}
static func buildBlock<T1, T2, T3>(_ t1: T1, _ t2: T2, _ t3: T3) -> some P<(T1, T2, T3)> {
return S((t1, t2, t3))
}
static func buildOptional<T>(_ value: T?) -> T? { return value }
}
do {
func test<T, U>(_: T, @Builder _: () -> some P<U>) {}
// CHECK: ---Initial constraints for the given expression---
// CHECK: (integer_literal_expr type="[[LITERAL_VAR:\$T[0-9]+]]" {{.*}}
// CHECK: (attempting type variable binding [[CLOSURE:\$T[0-9]+]] := () -> {{.*}}
// CHECK-NOT: (attempting type variable binding [[LITERAL_VAR]] := {{.*}}
// CHECK: (attempting conjunction element pattern binding element @ 0
// CHECK: (applying conjunction result to outer context
// CHECK: (attempting type variable binding [[LITERAL_VAR]] := Int
test(42) {
1
""
}
}
do {
func test<T, U>(_: T, @Builder _: (T) -> some P<U>) {}
// CHECK: ---Initial constraints for the given expression---
// CHECK: (integer_literal_expr type="[[LITERAL_VAR:\$T[0-9]+]]" {{.*}}
// CHECK: (attempting type variable binding [[LITERAL_VAR]] := Int
// CHECK: (attempting conjunction element pattern binding element @ 0
test(42) { v in
v
""
}
}
do {
func test<T: BinaryInteger, U>(@Builder _: (Bool) -> some P<T>, transform: (T?) -> U) {}
// CHECK: ---Initial constraints for the given expression---
// CHECK: (attempting type variable {{.*}} := () -> {{.*}}
// CHECK: (attempting conjunction element pattern binding element @ 0 :
// CHECK-NEXT: (pattern_named "x")
// CHECK: (attempting conjunction element syntactic element
// CHECK-NEXT: (call_expr {{.*}}
// CHECK: (attempting type variable {{.*}} := (Bool) -> {{.*}}
// CHECK: (attempting conjunction element pattern binding element @ 0
// CHECK: (pattern_named implicit "$__builder{{.*}}")
// CHECK: (applying conjunction result to outer context
// CHECK: (attempting type variable {{.*}} := (Int?) -> {{.*}}
// CHECK: (attempting disjunction choice {{.*}} bound to decl {{.*}}.Int.init(_:)
let _ = {
let x = 42
test { cond in
x
} transform: { v in
Int(v ?? 0)
}
}
}
|
