We've split the non-associative exceptions into the base class,
X::Syntax::NonAssociative, with a subclass off X::Syntax::NonListAssociative.
nqp's EXPR now calls a different method to fail list associativity, and rakudo
provides the alternate method to get the appropriate message.
nqp fix in
# New Ticket Created by Aaron Sherman
# Please include the string: [perl #128811]
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>From tonight's IRC:
[01:01] I'm not sure how to read this error: Only identical
