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Simon Peyton Jones authored
This easy-to-make mistake meant that pattern-synonym matcher and builder Ids weren't being treated as locally defined by the simpplier. That meant that we never looked up them up in the environment, got an out-of-date unfolding, which made the Simplifier fall into an infinite loop. This was the cause of Trac #98587, but it was quite tricky to find! In a separate patch I'll make Lint check for locally-bound GlobalIds, since they are always an error.
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