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// RUN: %target-swift-frontend -typecheck -print-diagnostic-groups -swift-version 4 %s -verify
func testPopFirst() {
let str = "abc"
var charView: String.CharacterView // expected-warning{{'CharacterView' is deprecated: Please use String directly [DeprecatedDeclaration]}}
charView = str.characters // expected-warning{{'characters' is deprecated: Please use String directly [DeprecatedDeclaration]}}
dump(charView)
var substr = str[...]
_ = substr.popFirst() // ok
_ = substr.characters.popFirst() // expected-warning{{'characters' is deprecated: Please use Substring directly [DeprecatedDeclaration]}}
_ = substr.unicodeScalars.popFirst() // ok
var charSubView: Substring.CharacterView // expected-warning{{'CharacterView' is deprecated: Please use Substring directly [DeprecatedDeclaration]}}
charSubView = substr.characters // expected-warning{{'characters' is deprecated: Please use Substring directly [DeprecatedDeclaration]}}
dump(charSubView)
var _ = String(str.utf8) ?? "" // expected-warning{{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}}
var _: String = String(str.utf8) // ok
}
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