:info panics when used on breakpoint bindings

[mnislaih]

After stopping at a breakpoint, asking GHCi for :info about the bindings causes a panic. I have only tested in Mac Os 10.5, but I expect the behaviour to be consistent in all platforms.

[qsort.hs:(1,0)-(3,54)] *Main> :step
Stopped at qsort.hs:2:16-51
_result :: [Integer] = _
a :: Integer = 1
left :: [Integer] = _
right :: [Integer] = _

[qsort.hs:2:16-51] *Main> :i left 
left ::ghc-6.8.20070911: panic! (the 'impossible' happened)
  (GHC version 6.8.20070911 for i386-apple-darwin):
	nameModule left{v I15U}

[mnislaih]

I am validating the fix. Shame on our testsuite for letting this one slip into the release

[mnislaih]

Wed Nov 14 15:33:43 PST 2007  Pepe Iborra <mnislaih@gmail.com>
 * Make pprNameLoc more robust in absence of loc information

   M ./compiler/basicTypes/Name.lhs -1 +4

[igloo]

Merged