Hello Benedikt, Thanks for all this. From memory, notes, and (last resort) trac search, the HughesPJ-related trac tickets on the GHC trac are: #669 negative indentation in Text.PrettyPrint.HughesPJ #1176 Infinite loop when printing error message #1217 Add zeroText to Text.PrettyPrint.HughesPJ #1337 Fix wrong indentation from Text.PrettyPrint.HughesPJ fill (fcat and fsep) I have added comments to #669 and #1176 that I hope speak for themselves. The problem reported in #1337 has a fix (Fix of wrong indentation from HughesPJ fill (fcat and fsep)), it may still provide some inspiration. On Wednesday 25 June 2008 14:41, Benedikt Huber wrote:
... thorkil: Can you help me with a simplified test case (pretty printer only) of Bug #1176 ?
#1176 is a case of #1337 for the internal GHC version of the HughesPJ library and I expect a fix of #1337 to be applicable to the internal GHC library, hence fixing #1176. So I expect the failing cases for #1337 to fail for #1176 as well, but being, unfortunately, somewhat less easily exercised.
Also, I didn't find any regressions tests for the pretty printer - I'll create some if someone points me in the right direction.
The patch (Patch with HughesPJ tests with automated high-level coverage check) attached to #1337 has some tests, but also some rather bombastic things that attempts to ensure some coverage of the tests. This was created at a point in time where hpc was not available.
...
Thanks and best regards Thorkil