Re: Undo defalias

[Gregory Heytings]

> The POC you posted works only if `message` was redefined in some 
> particular way, such as when a loading a file that has
>
> (defalias 'message #'ignore)
>
> but then it wouldn't be the result of a bug but of deliberate harm :-)

My understanding is that this is what the OP did, and he wanted to "undo" 
what he did.  With a Lisp function you can always open the source file 
again and C-M-x, but with a C function that's not possible.

> AFAIK most cases where `message` can end up aliased to `ignore` is when 
> you have code doing
>
> (cl-letf (((symbol-function 'message) #'ignore))
>   ...)
>
> In that case, the previous value won't be found in `function-history`. 
> As for why is the `ignore` rebinding is still active...

But in that case the meaning of message is restored when the cl-letf is 
left, no?  Am I missing something?