[perl #76884] [BUG] Null PMC access on grammar match object

[via RT]

# New Ticket Created by  Tadeusz Sośnierz 
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The following code:

  grammar grr {
        token TOP {
                <line>*
        }
        token line { .* \n }
  }
  
  my $match = grr.parse('foo bar asd');
  unless $match {
                die 'oh noes!'
  }
  say $match[0].perl;

Results in the following behaviour:

  Null PMC access in find_method('perl')
    in <anon> at line 1202:CORE.setting
    in 'Any::join' at line 1
    in 'Mu::attribs' at line 1203:CORE.setting
    in 'Mu::perl' at line 1207:CORE.setting
    in main program body at line 14:parser.pl

Whereas it should it should return a failure, for there is no $match[0]