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This makes diagnostics more verbose and accurate, because it's possible to distinguish how many parameters there are based on the message itself. Also there are multiple diagnostic messages in a format of `<descriptive-kind> <decl-name> ...` that get printed as e.g. `subscript 'subscript'` if empty labels are omitted.
31 lines
1.8 KiB
Swift
31 lines
1.8 KiB
Swift
// RUN: %target-swift-frontend -typecheck -swift-version 4 %s -verify
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func testPopFirst() {
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var str = "abc"
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_ = str.popFirst() // expected-error{{'popFirst()' is unavailable: Please use 'first', 'dropFirst()', or 'Substring.popFirst()'}}
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_ = str.characters.popFirst() // expected-warning{{'characters' is deprecated: Please use String directly}}
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// expected-error@-1{{'popFirst()' is unavailable: Please use 'first', 'dropFirst()', or 'Substring.popFirst()'}}
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_ = str.popFirst() // expected-error{{'popFirst()' is unavailable: Please use 'first', 'dropFirst()', or 'Substring.popFirst()'}}
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_ = str.unicodeScalars.popFirst() // expected-error{{'popFirst()' is unavailable: Please use 'first', 'dropFirst()', or 'Substring.UnicodeScalarView.popFirst()'}}
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var charView: String.CharacterView // expected-warning{{'CharacterView' is deprecated: Please use String directly}}
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charView = str.characters // expected-warning{{'characters' is deprecated: Please use String directly}}
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dump(charView)
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var substr = str[...]
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_ = substr.popFirst() // ok
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_ = substr.characters.popFirst() // expected-warning{{'characters' is deprecated: Please use Substring directly}}
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_ = substr.unicodeScalars.popFirst() // ok
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var charSubView: Substring.CharacterView // expected-warning{{'CharacterView' is deprecated: Please use Substring directly}}
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charSubView = substr.characters // expected-warning{{'characters' is deprecated: Please use Substring directly}}
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dump(charSubView)
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var _ = String(str.utf8) ?? "" // expected-warning{{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}}
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var _: String = String(str.utf8)! // expected-error{{'init(_:)' is unavailable: Please use non-failable String.init(_:UTF8View) instead}}
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var _: String = String(str.utf8) // ok
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}
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