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Strangely my previous attempts at resolving this all seemed to end in perplexing segmentation faults in the GHC testsuite (including some rather recent attempts). Somehow this attempt miraculously works. However, there was one wrinkle that I still need to work out fully: we need to consider Lits as non-trivial in cpeArg. Failure to do this means that we would transform something like, $trModule = TrModule "HelloWorld"# into $trModule = case "HelloWorld"# of x { __DEFAULT -> TrModule x } Which then fails the consistentStgInfo check in CoreToStg for reasons that I am still trying to work out. Mark T12757 as fixed Reviewers: simonmar, simonpj, austin Reviewed By: simonpj Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2666 GHC Trac Issues: #11158
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