[bug-gawk] gawk 4.1.3 gensub() warning

[Ed Morton]

I'm seeing this new warning in gawk 4.1.3 executing existing scripts:

$ echo 'a' | gawk '{print gensub(/a/,"b","")}'
gawk: cmd. line:1: (FILENAME=- FNR=1) warning: gensub: third argument `' treated as 1
b

This will impact a ton of scripts, like if sed suddenly started issuing warnings if you wrote `s/foo/bar/` instead of `s/foo/bar/1`. Is it here to stay?

    Ed.