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In outHsLine, paths passed to construct invocations of hsc_line must be escaped twice in order to generate a properly escaped string literal that will end up in the eventual LINE pragma emitted by this code. This is especially important on Windows paths, where backslashes would otherwise be treated as C escape sequences and result in the incorrect Windows paths. Adds test case to verify that hsc2hs properly escapes file paths in LINE pragmas Updates the hsc2hs submodule. See https://ghc.haskell.org/trac/ghc/ticket/12504 Reviewers: erikd, hvr, austin, bgamari, Phyx Reviewed By: erikd, Phyx Subscribers: thomie, Phyx, mpickering Differential Revision: https://phabricator.haskell.org/D2478 GHC Trac Issues: #12504
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