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authorsheaf <sam.derbyshire@gmail.com>2022-05-25 00:50:38 +0200
committerMarge Bot <ben+marge-bot@smart-cactus.org>2022-05-25 01:36:48 -0400
commit2ff18e390b119c611b3dd429b76cfcbf36ef9545 (patch)
treea3a1617fa99ead32d6aa9ee5476c973698de5904 /testsuite/tests/rebindable/RebindableFailA.stderr
parent9973c0167c266dad1c9c6f2b96dbba3c29c22062 (diff)
downloadhaskell-2ff18e390b119c611b3dd429b76cfcbf36ef9545.tar.gz
SimpleOpt: beta-reduce through casts
The simple optimiser would sometimes fail to beta-reduce a lambda when there were casts in between the lambda and its arguments. This can cause problems because we rely on representation-polymorphic lambdas getting beta-reduced away (for example, those that arise from newtype constructors with representation-polymorphic arguments, with UnliftedNewtypes).
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