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From: Arash Esbati <arash@gnu.org>
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Subject: Question about cl-flet and cl-letf
Date: Thu, 26 Oct 2023 22:10:23 +0200
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Hi all,

my understanding of the manual and docstring of the macros mentioned
above is that these two pieces of code should be equivalent:

  (cl-flet ((y-or-n-p #'always))
    (while (...)
      BODY))

  (cl-letf (((symbol-function 'y-or-n-p) #'always))
    (while (...)
      BODY))

I have an use-case where they are not.  Before getting into details
about the function (which is long) and trying to come up with a reduced
version: Am I correct with the assumption above?  Currently, my function
works with `cl-left' as expected and with `cl-flet' not, i.e.,
`y-or-no-p' returns t inside BODY with `cl-letf' and not with `cl-flet'.

I'd appreciate if somebody would enlighten me.

Best, Arash