Re: [PATCH] Raise an error when detecting old-style backquotes.

[Stefan Monnier]

>> I don't think it'll make any real difference: in both cases the old code
>> won't work anymore: I'm hard pressed to think of a scenario where the
>> "subtle" behavior change is subtle enough not to be detected
>> fairly quickly.
> For example, code such as '(` foo) would change behavior.  Whether a certain
> list is nested or not is definitely subtle enough.

But this is not a complete scenario.  You'd need to give additional
context:
- why is there '(` foo) in the source code (it seems already contrived)?
- How is the result used (it's important that the result be
  used in a way which works differently but without signaling an error
  in both cases)?


        Stefan