[Haskell-cafe] Spell-checking lhs files

Hi, recently I was spell-checking a literate Haskell source file (within the vim editor). The spell checker correctly ignored LaTeX commands, but I had to manually skip over code blocks inside |...|. This was really annoying and I couldn't figure out how to configure the spell checker to skip over code. Does anybody have a solution for that? Thanks a lot, Petr