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Updated doc string for traceShow.

Oleg Alexander requested to merge OlegAlexander/ghc:OlegAlexander-master-patch-93311 into master

Hello,

This is a small doc string change for the traceShow function in Debug.Trace. The change clarifies that it's possible to use traceShow with variable labels in a tuple, like this:

traceShow ("label", expr) expr

Please see the short discussion here as to why this clarification may be useful for newcomers to Haskell.

https://github.com/haskell/core-libraries-committee/issues/224

Thank you. @chreekat

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