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const (
	// ILLEGAL represents a non-identifier.
	ILLEGAL token = iota
	// ACTION should be an action a tester should take.
	ACTION
	// EXPECT should be an expectation a tester should have.
	EXPECT
	// GROUP is a human friendly identifier for the group of tests.
	GROUP
	// DEPS represents other groups that should come before this one.
	DEPS
	// PRIORITY allows for order within a collection of groups.
	PRIORITY
)