Can anyone explain why ghc does not treat the following as a valid literate haskell program? --------- test.lhs ---- # This is a test
foo = reverse . words
------------------------ When I try to load this in ghci (or compile it using ghc), I get: test.lhs:1:2: lexical error at character 'T' It seems that the problem is the '#' character in the first column. Replacing it with something else, or moving it to the right one space, solves the problem. The following literate haskell program, from http://notvincenz.blogspot.com/2008/01/literate-haskell-and-c.html, also fails to load for me, for the same reason (the leading '#' in line 8). ---- literate-haskell-and-c.lhs --- /* c and lhs file
module Foo where main = print "Haskell"
*/ #include int main() { printf("C\n"); return 0; } ------------------------------------ I've reproduced this with ghc 6.10.1 and ghc 6.8.3 (linux binaries from haskell.org) and with ghc 6.8.2 (Ubuntu intrepid). Interestingly, hugs (September 2006 version) has no trouble with test.lhs. I haven't tried ghc 6.6. I care about this because I'd like to use markdown conventions to format the comment parts of literate haskell programs. Markdown supports atx-style headers, which begin with strings of '#' characters starting in the first column. I know that some people use markdown with literate haskell, so there must be something basic here that I'm missing! John