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[stdlib] Backward-compatible String.UTF8View slicing

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When slicing String.UTF8View in Swift 3 mode, in the absence of type
context, produce String.UTF8View.
This commit is contained in:
Dave Abrahams
2017-07-17 14:32:58 -07:00
committed by Joe Shajrawi
parent 3f308b7a99
commit 05ff40d125
2 changed files with 58 additions and 17 deletions
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13
test/stdlib/StringCompatibility.swift
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@@ -336,6 +336,19 @@ Tests.test("LosslessStringConvertible/generic/\(swift)") {
f(String.self)
}
#if swift(>=4)
public typealias ExpectedUTF8ViewSlice = String.UTF8View.SubSequence
#else
public typealias ExpectedUTF8ViewSlice = String.UTF8View
#endif
Tests.test("UTF8ViewSlicing") {
let s = "Hello, String.UTF8View slicing world!".utf8
var slice = s[s.startIndex..<s.endIndex]
expectType(ExpectedUTF8ViewSlice.self, &slice)
_ = s[s.startIndex..<s.endIndex] as String.UTF8View.SubSequence
}
#if !swift(>=4)
Tests.test("LosslessStringConvertible/force unwrap/\(swift)") {
// Force unwrap should still work in Swift 3 mode