ticket for grammar end anchoring

[cedric-vincent]

Reference: http://irclog.perlgeek.de/perl6/2011-12-18#i_4846857

Tested on 5abbd8a:

grammar Test { token TOP { . } }; say $(Test.parse: 'test') ~~ Match

Expected output:

Bool::True

Current output:

Bool::False

[cedric-vincent]

Actually 5abbd8a does return a match object when the input is fully matched:

niecza> grammar Test { token TOP { .* } }; say $(Test.parse: 'test') ~~ Match
Bool::True

Is it related to LTM support in Niecza? Or maybe I wrongly assumed
that parse does not have to fully match the input, as with a
regular match:

niecza> my $token = token { . }; say ?('test' ~~ m/$token/)
Bool::True
niecza> grammar Test { token TOP { . } }; say ?(Test.parse: 'test')
Bool::False

[sorear]

It is my opinion that grammars should normally require a full match, since trailing garbage after a file is normally supposed to be a syntax error. Rakudo currently does not do this, and the spec does not really say (I think it slightly hints towards my interpretation, but that's probably some kind of cognitive bias). Leaving open because this item needs to reach consensus.