Variable: comment-end-can-be-escaped
comment-end-can-be-escaped is a buffer-local variable defined in
syntax.c.
Documentation
Non-nil means an escaped ender inside a comment doesn't end the comment.
Probably introduced at or before Emacs version 25.1.
Source Code
// Defined in /usr/src/emacs/src/syntax.c
DEFVAR_BOOL ("comment-end-can-be-escaped", comment_end_can_be_escaped,
doc: /* Non-nil means an escaped ender inside a comment doesn't end the comment. */);