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swift-mirror/test/Migrator/substring_to_string_conversion.swift.expected
David Farler be86bcac1d [Migrator] Suggest String <-> Substring conversions
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
2017-05-04 16:40:56 -07:00

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let s = "Hello"
let ss = s[s.startIndex..<s.endIndex]
// CTP_Initialization
do {
let s1: String = String({ return ss }())
_ = s1
}
// CTP_ReturnStmt
do {
func returnsAString() -> String {
return String(ss)
}
}
// CTP_ThrowStmt
// Doesn't really make sense for this fix-it - see case in diagnoseContextualConversionError:
// The conversion destination of throw is always ErrorType (at the moment)
// if this ever expands, this should be a specific form like () is for
// return.
// CTP_EnumCaseRawValue
// Substrings can't be raw values because they aren't literals.
// CTP_DefaultParameter
do {
func foo(x: String = String(ss)) {}
}
// CTP_CalleeResult
do {
func getSubstring() -> Substring { return ss }
let gottenString : String = String(getSubstring())
_ = gottenString
}
// CTP_CallArgument
do {
func takesAString(_ s: String) {}
takesAString(String(ss))
}
// CTP_ClosureResult
do {
[ss].map { (x: Substring) -> String in String(x) }
}
// CTP_ArrayElement
do {
let a: [String] = [ String(ss) ]
_ = a
}
// CTP_DictionaryKey
do {
let d: [ String : String ] = [ String(ss) : s ]
_ = d
}
// CTP_DictionaryValue
do {
let d: [ String : String ] = [ s : String(ss) ]
_ = d
}
// CTP_CoerceOperand
do {
let s1: String = String(ss) as String
_ = s1
}
// CTP_AssignSource
do {
let s1: String = String(ss)
_ = s1
}