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Commit 6840012e authored by Simon Peyton Jones's avatar Simon Peyton Jones Committed by Marge Bot
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Fix eta reduction 

Issue #23922 showed that GHC was bogusly eta-reducing a join point.
We should never eta-reduce (\x -> j x) to j, if j is a join point.

It is extremly difficult to trigger this bug.  It took me 45 mins of
trying to make a small tests case, here immortalised as T23922a.
parent 56b403c9
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