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A `let` binding of a copyable subpattern can create an independent variable which should be copyable and consumable without affecting a borrowed move-only base. In the same way that `borrowing` parameters are no-implicit-copy, though, explicitly `_borrowing` subpatterns of copyable type should be no-implicit-copy as well.
59 lines
1.8 KiB
Swift
59 lines
1.8 KiB
Swift
// RUN: %target-swift-frontend -typecheck -dump-ast %s | %FileCheck %s
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struct A {
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static func ~=(pattern: B, subject: A) -> Bool { return true }
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static func ~=(pattern: C, subject: borrowing A) -> Bool { return true }
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static func ~=(pattern: D, subject: consuming A) -> Bool { return true }
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}
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struct B { }
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struct C { }
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struct D { }
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struct E { }
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struct F { }
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struct G { }
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func ~=(pattern: E, subject: A) -> Bool { return true }
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func ~=(pattern: F, subject: borrowing A) -> Bool { return true }
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func ~=(pattern: G, subject: consuming A) -> Bool { return true }
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// CHECK-LABEL: (func_decl{{.*}} "test(value:)"
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func test(value: A) {
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// CHECK: (switch_stmt
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switch value {
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// CHECK: (case_stmt
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// CHECK: (case_label_item ownership=borrowing
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// CHECK: (pattern_expr type="A" ownership=borrowing
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case B():
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break
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// CHECK: (case_stmt
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// CHECK: (case_label_item ownership=borrowing
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// CHECK: (pattern_expr type="A" ownership=borrowing
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case C():
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break
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// CHECK: (case_stmt
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// CHECK: (case_label_item ownership=borrowing
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// CHECK: (pattern_expr type="A" ownership=consuming
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case D():
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break
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// CHECK: (case_stmt
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// CHECK: (case_label_item ownership=borrowing
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// CHECK: (pattern_expr type="A" ownership=borrowing
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case E():
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break
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// CHECK: (case_stmt
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// CHECK: (case_label_item ownership=borrowing
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// CHECK: (pattern_expr type="A" ownership=borrowing
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case F():
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break
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// CHECK: (case_stmt
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// CHECK: (case_label_item ownership=borrowing
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// CHECK: (pattern_expr type="A" ownership=consuming
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case G():
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break
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// CHECK: (case_stmt
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// CHECK: (case_label_item default ownership=borrowing
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default:
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break
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}
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}
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