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Some APIs that expected a String now expect a Substring and vice versa. To ease the transition, emit fix-its on conversion errors between these types that the migrator can pick up. When converting from Substring -> String, suggest wrapping in `String.init`. When converting from String -> Substring, suggest appending the void subscript `[]`. (This isn't implemented yet so this is hidden behind a flag). This can possibly be generalized later when converting between some sequence and its subsequence, such as Array and ArraySlice, for example. rdar://problem/31665649 rdar://problem/31666638
79 lines
1.3 KiB
Plaintext
79 lines
1.3 KiB
Plaintext
let s = "Hello"
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let ss = s[s.startIndex..<s.endIndex]
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// CTP_Initialization
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do {
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let s1: String = String({ return ss }())
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_ = s1
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}
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// CTP_ReturnStmt
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do {
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func returnsAString() -> String {
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return String(ss)
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}
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}
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// CTP_ThrowStmt
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// Doesn't really make sense for this fix-it - see case in diagnoseContextualConversionError:
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// The conversion destination of throw is always ErrorType (at the moment)
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// if this ever expands, this should be a specific form like () is for
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// return.
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// CTP_EnumCaseRawValue
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// Substrings can't be raw values because they aren't literals.
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// CTP_DefaultParameter
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do {
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func foo(x: String = String(ss)) {}
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}
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// CTP_CalleeResult
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do {
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func getSubstring() -> Substring { return ss }
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let gottenString : String = String(getSubstring())
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_ = gottenString
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}
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// CTP_CallArgument
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do {
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func takesAString(_ s: String) {}
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takesAString(String(ss))
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}
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// CTP_ClosureResult
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do {
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[ss].map { (x: Substring) -> String in String(x) }
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}
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// CTP_ArrayElement
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do {
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let a: [String] = [ String(ss) ]
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_ = a
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}
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// CTP_DictionaryKey
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do {
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let d: [ String : String ] = [ String(ss) : s ]
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_ = d
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}
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// CTP_DictionaryValue
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do {
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let d: [ String : String ] = [ s : String(ss) ]
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_ = d
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}
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// CTP_CoerceOperand
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do {
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let s1: String = String(ss) as String
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_ = s1
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}
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// CTP_AssignSource
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do {
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let s1: String = String(ss)
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_ = s1
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}
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