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Michael Snoyman authored
This avoids the compiler from crashing when, for example, a warning contains a non-Latin identifier and the LANG variable is set to C. Fixes #6037. Test Plan: Create a Haskell source file containing an identifier with non-Latin characters and no type signature. Compile with `LANG=C ghc -Wall foo.hs`, and it should fail. With this patch, it will succeed. Reviewers: austin, rwbarton, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1153 GHC Trac Issues: #6037, #10762
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