undo lust substitution made with :%s/foo/bar/gc

Hello,

Is there a quick way to undo only the very last substitution made
while performing '%s/foo/bar/gc' *while in the substitution mode*. I
think I am asking whether there is something I can do at "replace with
le (y/n/a/q/l/^E/^Y)?' prompt to go back one substitution.

Use-case is something like: I go through the file, only making a
couple of changes (but skipping many-many matches). I then screw one
up. I either need to go back and make all those changes again, or -
ideally - press something to undo my decision on the last prompt.
Preferably it'd be the latter.

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