# nhc98 error messages ### What does this error message mean? Like all compilers, the error messages produced by the nhc98 are sometimes difficult to understand. Here are a few tips as to what might have gone wrong. `Only 32 words after gc, need 32 words` The garbage collector failed to reclaim enough space - the program is out of heap. Try re-running with +RTS -Hn -RTS where n is a bigger heap size, e.g. 16M. `Type error: cannot unify types Prelude.2 and Prelude.3 at 133:9` In type errors, pairs, triples, and other tuples are denoted by their arity - thus Prelude.2 means pair. The notation 133:9 means line 133, character position 9. `arityIS in IntState.hs couldn't find 376` If you get an error message like this and you have an (n+k) pattern in your program, then you have found a bug in the compiler. Please report it! The latest updates to these pages are available on the WWW from `http://www.haskell.org/nhc98/` 10th June 1999 York Functional Programming Group