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Commit 149d7912 authored by Simon Peyton Jones's avatar Simon Peyton Jones Committed by Ben Gamari
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Fix error recovery for pattern synonyms 

As Trac #15289 showed, we were carrying on after a type error
in a pattern synonym, and then crashing.  This patch improves
error handling for pattern synonyms.

I also moved a bit of code from TcBinds into TcPatSyn, which
helpfully narrows the API.

(cherry picked from commit 2896082e)
parent 4cfeca02
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