# { bar => DEPEND_LINKS } is an influence on that result, because changing
# bar's links could change the outcome; so its influences are not the same
# as when testing whether link(foo) matches baz.
+#
+# Static influences are one of the things that make pagespec_match_list
+# more efficient than repeated calls to pagespec_match.
sub influences_static {
return ! $_[0][1]->{""};