Re: attempt to kill non-existant buffer leads to error

[Richard M. Stallman]

    when there is no *info* buffer,

        (kill-buffer "*info*")

    causes an error to be signaled.

That's right.

    However, in GNU Emacs 20.7.2 (i386-debian-linux-gnu, X toolkit) the
    following message is presented in the echo area and in the *Messages*
    buffer:

        No buffer named *info*

    which is correct.  No error is generated.

It probably signals an error which is handled at top level.
The only difference is that the debugger doesn't run.

In the current Emacs, certain commands to eval an expression
also enable the debugger to handle errors.