#4150: CPP+QuasiQuotes confuses compilation errors' line numbers -------------------------------------+------------------------------------- Reporter: yairchu | Owner: Type: bug | Status: new Priority: low | Milestone: 7.12.1 Component: Compiler | Version: 6.12.3 (Parser) | Keywords: Resolution: | Architecture: Operating System: Unknown/Multiple | Unknown/Multiple Type of failure: Incorrect | Test Case: warning at compile-time | quasiquotation/T4150 Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by ezyang): So, to fix this, we need to augment the multi-line comment and quasi-quote lexing in `Lexer.x` to look for and handle the CPP produced line pragmas (as handled currently by the `<bol>` state). It should be possible, though a bit delicate since both of these lexers are hand-rolled. While I was reading how this code worked, I realized there is a workaround: if you force the line-state to resynchronize, e.g. by include'ing a blank file outside of the quasiquote/multiline comment, you'll get right light numbers for anything afterwards. If you want this in 7.10 (there's not much time left) you can help out by cooking up a self-contained, minimal example for quasiquoters which we can put in the test suite. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/4150#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler