Docs on bugreporting should elaborate on creating a stack trace

[untitaker]

http://doc.rust-lang.org/complement-bugreport.html#what-information-should-i-include-in-a-bug-report?

Finally, if you can run the offending command under gdb, pasting a stack trace can be useful; to do so, you will need to set a breakpoint on rust_panic.

This doesn't explain anything to me, but a short added explanation probably won't suffice either.

[steveklabnik]

This will end up being removed by #19738, which was just r+'d.