Member predicate Guard :: isEquality
Holds if this guard is an equality test between e1 and e2. The test
can be either ==, !=, .equals, or a switch case. If the test is
negated, that is !=, then polarity is false, otherwise polarity is
true.
predicate
isEquality
(
Expr
e1
,
Expr
e2
,
boolean
polarity
)