[perl #77022] Grammar.parse doesn't anchor to the end of the parsed string

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# New Ticket Created by  Tyler Curtis 
# Please include the string:  [perl #77022]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=77022 >


[1:38pm] tylercurtis: rakudo: grammar Foo { token TOP { 'b' } }; say
Foo.parse('abc').Bool; # this is right
[1:38pm] p6eval: rakudo 19931f: OUTPUT«0␤»
[1:38pm] tylercurtis: rakudo: grammar Foo { token TOP { 'b' } }; say
Foo.parse('bc').Bool; # I don't think this is.
[1:38pm] p6eval: rakudo 19931f: OUTPUT«1␤»
[1:38pm] tylercurtis: rakudo: grammar Foo { token TOP { 'b' } }; say
Foo.parse('ab').Bool; # Also right.
[1:38pm] p6eval: rakudo 19931f: OUTPUT«0␤»
[1:39pm] tylercurtis: Grammar.parse seems to anchor to the beginning
of the string but not to the end.

If I correctly understand the behavior of Grammar.parse and regex
methods, only "b" should match the Foo grammar above because regex
methods are automatically anchored to the beginning and end of the
string when called directly as Grammar.parse should do with Foo.TOP.

-- 
Tyler Curtis