id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
5320,check_overlap panic (7.1 regression),mikhail.vorozhtsov,simonpj,"The attached program is rightfully rejected by GHC 7.0.4 (with {{{""Could not deduce (HMapClass f l) ...""}}}) but makes GHC HEAD panic:
{{{
$ ghc-7.3.20110713 Overlap.hs 
[1 of 1] Compiling Overlap          ( Overlap.hs, Overlap.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 7.3.20110713 for x86_64-unknown-linux):
	check_overlap
    main:Overlap.HDropClass{tc raS}
      main:Overlap.PZero{tc raZ}
      (main:Overlap.HMap{tc raN} f{tv adi} [sk] l{tv adk} [sk])

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

}}}
Both versions are built with the devel2 BuildFlavour.
",bug,new,normal,7.6.2,Compiler,7.1,,,dimitris@…,Unknown/Multiple,Unknown/Multiple,Compile-time crash,,,,,