Judging from affect files, probably
commit c269b7e85524f4a8be3cd0f00e107207ab9197af
Author: Dr. ERDI Gergo <ge...@erdi.hu>
Date: Thu Apr 10 22:13:00 2014 +0800
Split off pattern synonym definition checking from pattern inversion
Edward
Excerpts from Joachim Breitner's message of 2014-04-11 13:19:06 -0700:
> Hi,
>
> someone introduced a validate error recently:
>
> compiler/typecheck/TcPatSyn.lhs:324:19:
> Warning: Defined but not used: `lit'
>
> compiler/typecheck/TcPatSyn.lhs:325:17:
> Warning: Defined but not used: `n'
>
>
> Greetings,
> Joachim
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