NOTE	ASSOCIATIVITY=bug
NOTE	SUBEXPRESSION=bug
NOTE	REPEAT_LONGEST=bug
NOTE	BUG=alternation-order-UNKNOWN
NOTE	BUG=unknown-match
NOTE	BUG=nomatch-match-UNKNOWN
NOTE	BUG=range-null-UNKNOWN
NOTE	BUG=repeat-any-UNKNOWN
NOTE	BUG=repeat-null-UNKNOWN
NOTE	BUG=repeat-short-UNKNOWN
NOTE	BUG=repeat-artifact-UNKNOWN
NOTE	BUG=repeat-artifact-nomatch-UNKNOWN
NOTE	BUG=subexpression-first-UNKNOWN