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bug#59213: Emacs 29: Edebug fails to instrument a parameter whose name b
From: |
Stefan Monnier |
Subject: |
bug#59213: Emacs 29: Edebug fails to instrument a parameter whose name begins with _ |
Date: |
Mon, 14 Nov 2022 07:56:34 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
> More precisely, with this defun:
>
> (defun add (a b c)
> (+ a b))
>
> , instrument it for edebug. Call M-: (add 1 2 6).
>
> The source code with active edebug now looks like:
>
> (defun add (a b c)
> =>(+ a b))
>
> .. `e a` now returns 1. `e b` returns 2. `e c` gives the error message:
>
> Error: Symbol's value as variable is void: c
>
> .. I repeat, this is a bug. It should have returned 6.
[ Well, GDB does the same and claims it's not a bug, instead it says the
variable has been optimized away or something to that effect. ]
Agreed. Edebug should be careful to prevent unused vars from being
optimized away. I'll try and come up with a good patch for that,
Stefan