d51cf3e3ff
Upstream changes:
0.060 2018-06-16 T. R. Wyant
\N{} now parses as the unknown token, not NoOp, regardless of the
setting of 'use re qw< strict >;'. \N{} became unconditionally fatal
in 5.28.0 (5.27.1, actually). The policy when the parse changes is
to use the most-modern parse. Hence this change.
As a side effect of this, the unknown token's explain() method now
returns something -- normally the associated error.
Add method remove_insignificant(). If the invocant isa Node, this
returns a clone of the invocant with non-significant elements
removed. Otherwise it returns either the invocant or nothing.
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