#3719: Literate code with # ----------------------------------------------+---------------------------- Reporter: zenzike | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler (Parser) | Version: 6.10.4 Resolution: wontfix | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects valid program | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Changes (by heisenbug): * difficulty: => Unknown Comment: `unlit` already has shebang filtering: https://github.com/ghc/ghc/blob/master/utils/unlit/unlit.c#L184 Why not give a `-filter-cpp` option to it, so that all lines with whitespace followed by '#' are filtered out? Then GHC (when invoked with -XNoCPP) would just pass on `-filter-cpp` to `unlit`. My use-case is an `emacs` org-mode document with embedded literate Haskell like this: {{{ #+begin_src literate-haskell

expr2final :: (Arith' repr, Cond repr) => Expr a -> repr a expr2final (Lit i) = lit' i expr2final (e `Plus` e') = expr2final e `plus'` expr2final e' expr2final (e `Cmp` e') = expr2final e `cmp` expr2final e' expr2final (If c e e') = if' (expr2final c) (expr2final e) (expr2final e')

#+end_src }}} This results in the same error {{{ lexical error at character '+' }}} and is pretty annoying. Org-mode expects the '#' int the first column, so indenting does not help here. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3719#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler