[merge] Control-backspace to drop into the debugger

[Robert Collins]

On Tue, 2007-04-17 at 14:57 +1000, Martin Pool wrote:
> This patch lets you press C-\ to go into pdb at any time.   This is
> pretty useful if it has hung, or just if you want to see what is
> taking time.
> 
> As always you can then type 'c' to continue execution.  This will in
> some cases find problems where we don't handle EINTR correctly, but
> those are bugs in other cases and should be fixed.


How is this different to 'BZR_PDB=1 bzr' ? Do we need both? Or should we
remove that variable in this patch?

Rob
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