haskell/haskell-mode — pull request #106 by nurpax (2012-12-28 13:54:55+00:00)
Title: Add a customization option for the default visibility of multi-line errors

Haskell interactive mode shows only the first line of a compiler error
by default. This change makes this customizable so that users can
decide on their own if they want to see the full compiler errors by
default, rather than always collapsing them away.