hat 2.04-0ubuntu2 (i386 binary) in ubuntu dapper

 This package contains a source-level tracer for analyzing the
 behavior (and searching for bugs) in your Haskell programs.
 .
 Hat actually consists of several utilities that are used to
 perform the actual analysis. See the package documentation for
 usage details.
 .
 You will also need a package containing the library compiled for at
 least one Haskell compiler for this to be useful.