In 15.10.2.5, the first step for the production "Term :: Assertion" is as follows:
1. Evaluate Assertion to obtain an AssertionTester t.
However, among the six productions for Assertion in 15.10.2.6, two of them do not return AssertionTester. While each of the following four productions returns an internal AssertionTester closure:
Assertion :: ^
Assertion :: $
Assertion :: \ b
Assertion :: \ B
each of the following two productions returns an internal Matcher closure:
Assertion :: ( ? = Disjunction )
Assertion :: ( ? ! Disjunction )
We believe that the production "Term :: Assertion" in 15.10.2.5 should evaluate by evaluating Assertion to obtain a Matcher and returning that Matcher, and the four productions for Assertion above should return an internal Matcher closure instead of an internal AssertionTester closure.