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ed3eaef179
This updates the error message so that in the case where we can find a Decl, it gives the error "cannot assign through subscript: 'name' is a read-only key path", and in the case where there's no associated Decl, gives the error message "cannot assign through subscript: key path is read-only". Additionally updates tests with the new error messages and formats all changes.
37 lines
1.1 KiB
Swift
37 lines
1.1 KiB
Swift
// RUN: %target-swift-frontend -typecheck -verify %S/Inputs/keypath.swift -primary-file %s -swift-version 5
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struct S {
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let i: Int
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init() {
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let _: WritableKeyPath<S, Int> = \.i // expected-error {{cannot convert value of type 'KeyPath<S, Int>' to specified type 'WritableKeyPath<S, Int>'}}
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S()[keyPath: \.i] = 1
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// expected-error@-1 {{cannot assign through subscript: key path is read-only}}
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}
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}
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func test() {
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let _: WritableKeyPath<C, Int> = \.i // expected-error {{cannot convert value of type 'KeyPath<C, Int>' to specified type 'WritableKeyPath<C, Int>'}}
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C()[keyPath: \.i] = 1
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// expected-error@-1 {{cannot assign through subscript: key path is read-only}}
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let _ = C()[keyPath: \.i] // no warning for a read
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}
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struct T {
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private(set) var a: Int
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init(a: Int) {
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self.a = a
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}
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}
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func testReadOnlyKeyPathDiagnostics() {
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let path = \T.a
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var t = T(a: 3)
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t[keyPath: path] = 4 // expected-error {{cannot assign through subscript: 'path' is a read-only key path}}
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t[keyPath: \T.a] = 4 // expected-error {{cannot assign through subscript: key path is read-only}}
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}
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