Addressing the golfing request,
# 123
rgrep -e'->' * | perl -ne '/(\S{3,80}->\S{5,80})/;print $1,"\n"' | pe
+rl -pe's/^\(//' | perl -pe 's/^\+\+|^\-\-//' | sort | uniq
is sufficiently equivalent to
# 68
perl -ne's/^(\(|[+-]{2})//g,say for/(\S{3,80}->\S{5,80})/' *|sort -u
And since you already assume that you can't have two dereferencing expressions on the same line,
# 67
perl -ne's/^(\(|[+-]{2})//g,say for/\S{3,80}->\S{5,80}/g' *|sort -u
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