Huon Wilson 49277e4e05 [Parser] Don't warn about unescaping the _ in foo(_: 3). ...

foo(_: 3) is equivalent to foo(3), so calling a function that has _ as
an argument label (func foo(`_`: 3)) still requires the _ to be
escaped. Before this patch, the compiler would suggest removing the `s,
even though that changes behaviour.

Fixes rdar://problem/31077797.

2017-03-21 15:28:11 -07:00

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