[Haskell-cafe] Prelude.undefined

Alex MDC alex.mdc at gmail.com
Wed Mar 3 01:12:05 EST 2010

2010/3/3 Tom Hawkins <tomahawkins at gmail.com>

> On Wed, Mar 3, 2010 at 6:07 AM, Ivan Miljenovic
> -Wall only complains about shadow bindings, defined but not used, and
> no type signature.  But no unmatched patterns.

If you can run your code through the ghc debugger you can get it to break
when an undefined exception is raised.

The options are :set -fbreak-on-exception or -fbreak-on-error. More info in
the documentation at

Hope that helps,
Alex MDC
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