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Previously SetLevels.lvlMFE would fail to substitute in ticks, unlike lvlExpr. This lead to #13481. Fix this. Test Plan: `make test TEST=T12622 WAY=ghci` Reviewers: austin, simonpj Reviewed By: simonpj Subscribers: simonpj, rwbarton, thomie GHC Trac Issues: #13481 Differential Revision: https://phabricator.haskell.org/D3920
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