New answers tagged latex-kernel
It was added due to this bug reported: http://www.latex-project.org/cgi-bin/ltxbugs2html?category=AMS+LaTeX&pr=amslatex%2F3501
Some packages (particularly the AMS packages) redefine \@ifnextchar. Usually the redefined version has all of the properties of the original, but there are some places where the original is needed, which is what \kernel@ifnextchar is for. If you look at the places where it is used, you'll find that it is mainly used in the definitions associated to ...
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