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<rdar://20494686> String itsef should only expose Unicode-correct algorithms, like proper substring/prefix/suffix search, enumerating words/lines/paragraphs, case folding etc. Promoting sequence-centric algorithms to methods on String is not acceptable since it invites users to write wrong code. Thus, String has to lose its SequenceType conformance. Nevertheless, we recognize that sometimes it is useful to manipulate the String contents on lower levels (UTF-8, UTF-16, Unicode scalars, extended grapheme clusters), for example, when implementing high-level Unicode operations, so we can't remove low-level operations altogether. For this reason, String provides nested "views" for the first three low-level representations, but grapheme clusters were in a privileged position -- String itself is a collection of grapheme clusters. We propose to add a characters view that will represent the String as a collection of Character values. Swift SVN r28065
12 lines
251 B
Swift
12 lines
251 B
Swift
// RUN: %target-swift-frontend %s -emit-ir
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// Test case submitted to project by https://github.com/tmu (Teemu Kurppa)
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extension String : ExtensibleCollectionType {}
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func f<S : ExtensibleCollectionType>(seq: S) -> S {
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return S() + seq
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}
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f("a")
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