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As described in `Note [CoreSyn let/app invariant]` this is allowed. Fixes #14117. Test Plan: Build GHC with BuildFlavour=devel2 with -dstg-lint Reviewers: austin, simonpj Reviewed By: simonpj Subscribers: rwbarton, thomie GHC Trac Issues: #14117 Differential Revision: https://phabricator.haskell.org/D3857
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