Re: Tree-walker callbacks vs -Wdeprecated-non-prototype

I wrote:
> (That verbiage is from the gcc manual; clang seems to act the same
> except that -Wcast-function-type is selected by -Wall, or perhaps is
> even on by default.)

Nah, scratch that: the reason -Wcast-function-type is on is that
we explicitly enable it, and have done so since de8feb1f3 (v14).
I did not happen to see this warning with gcc because the test runs
I made with this patch already had c35ba141d, whereas I did my
clang test on another machine that wasn't quite up to HEAD.
So we should have good warning coverage for bogus walker signatures
on both compilers.

            regards, tom lane