darcs patch: Fix printing of 'impl' checks. (and 2 more)

[Thomas Schilling]

Fri Aug  3 22:06:22 CEST 2007  Thomas Schilling <nominolo at gmail.com>
  * Fix printing of 'impl' checks.

Fri Aug  3 22:08:29 CEST 2007  Thomas Schilling <nominolo at gmail.com>
  * Fix import path to HUnit.

Fri Aug  3 23:33:31 CEST 2007  Thomas Schilling <nominolo at gmail.com>
  * Change error message for tabs used as indentation to something more
  helpful.
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