nhc13 error messages

What does this error message mean?

Like all compilers, the error messages produced by the nhc13 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.

arityIS in IntState.hs couldn't find 376

You have probably used an (n+k) pattern in one of your equations.

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 latest updates to these pages are available on the WWW from http://www.cs.york.ac.uk/fp/nhc13/

1998.05.07
York Functional Programming Group
Malcolm.Wallace@cs.york.ac.uk