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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