The commit heading and body refer to a new function called current-line.

But the commit is basically adding a new optional arg absolute-p to
line-number-at-pos; I do not see any reference to a new function
current-line in the actual commit.

http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=ae98cdf9431604d0f722f1db217ca06debfbb7b6
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Kaushal Modi