File: StringCompatibilityDiagnostics.swift

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// RUN: %target-swift-frontend -typecheck -swift-version 5 %s -verify

func testPopFirst() {
  let str = "abc"
  let charView: String.CharacterView // expected-error{{'CharacterView' is unavailable: Please use String directly}}
  _ = str.characters // expected-error{{'characters' is unavailable: Please use String directly}}
  dump(charView)

  var substr = str[...]
  _ = substr.popFirst() // ok
  _ = substr.characters.popFirst() // expected-error{{'characters' is unavailable: Please use Substring directly}}
  _ = substr.unicodeScalars.popFirst() // ok

  let charSubView: Substring.CharacterView // expected-error{{'CharacterView' is unavailable: Please use Substring directly}}
  _ = substr.characters // expected-error{{'characters' is unavailable: Please use Substring directly}}
  dump(charSubView)
}