Allow breakpoints and single-stepping for functions defined interactively

[Michael D. Adams]

Steps to reproduce (from ghc-HEAD sources for 25 May 2007):

Prelude> let fib n = if n < 2 then 1 else fib (n-1) + fib (n-2)
Prelude> let main = print $ fib 30
Prelude> :break fib
ghc-6.7.20070515: panic! (the 'impossible' happened)
  (GHC version 6.7.20070515 for i386-unknown-linux):
        nameModule fib{v apa}

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

Prelude>

[igloo]

Thanks, I can reproduce that here too.

[simonmar]

I fixed the panic, but it's still not possible to do what you wanted to do, namely set a breakpoint on a function defined interactively. I'll leave that as a feature request, since it's not straightforward to implement right now.

[morabbin]

Fold this into #1377 (aggregate ticket for GHCi debugger tasks)?

[simonmar]

Replying to morabbin:

Fold this into #1377 (aggregate ticket for GHCi debugger tasks)?

It's generally better to have separate tickets for things, so we can fix them individually.