Doug Gregor b642c555be Allow one to change the argument labels of curried function parameters. ...

Curried function parameters (i.e., those past the first written
parameter list) default to having argument labels (which they always
have), but any attempt to change or remove the argument labels would
fail. Use the fact that we keep both the argument labels and the
parameter names in patterns to generalize our handling of argument
labels to address this problem.

The IDE changes are due to some positive fallout from this change: we
were using the body parameters as labels in code completions for
subscript operations, which was annoying and wrong.

Fixes rdar://problem/17237268.

Swift SVN r24525

2015-01-19 22:15:14 +00:00

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