Ben Langmuir feaaf39206 [sourcekitd-test] Make expand-placeholder iterative ...

Instead of getting all edits up front using the same source code, apply
each replacement before calculating the next. Placeholder expansion is
sensitive the surrounding code, so expanding multiple closures
separately can give different results from doing so in order. To allow
testing that, add a magic placeholder identifier __skip__ to skip
expansion during testing.

This is also required for handling multiple trailing closures.

2020-05-06 01:56:41 -04:00

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