Take care to not eta-reduce jumps in CorePrep (!2117) · Merge requests · Glasgow Haskell Compiler / GHC

Matheus Magalhães requested to merge zardyh/ghc:wip/core-prep-eta-joins into master Nov 08, 2019

In #17429 (closed) a bug came up where CorePrep was too eager to eta-reduce uses of JoinIds, leading to a Lint failure.

This patch fixes that issue by making tryEtaReducePrep consider JoinIds not OK-for-eta-reduction in the same way it treats Ids that respond True to hasNoBinding.

Take care to not eta-reduce jumps in CorePrep

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