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Joachim Breitner authored
as helpfully outlined by SPJ. This commit copies a small bit code from `SetLevels` which could reasonably be put in `Id` as `zapAllIdinfo`; I did not do this to make merging this commmit into `ghc-8.4` easier. If this commit gets merged, then presumably after commit 3f59d380 (test case) and ae0cff0a (other fixes to Exitify.hs). Differential Revision: https://phabricator.haskell.org/D4582
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