:D in a sub signature breaks the parser.

[vrurg]

The following sub signature breaks the parser:

sub foo(Callable:D $code) {
}

The type is irrelevant. Removal of :D "fixes" the problem.

Rakudo 2018.6 installed under my home directory, macOS High Sierra 10.13.5.

The error output follows:

Could not find symbol '&Catch-All'
  in method fall-through at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 547
  in method _typename at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 7340
  in method _type_constraint at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 7210
  in block  at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 6280
  in method __Parameter at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 6157
  in block  at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 6450
  in method _signature at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 6438
  in method _multisig at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 4119
  in block  at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 5707
  in method _routine_def at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 5642
  in method _routine_declarator at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 5621
  in method _EXPR at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 3420
  in method _statement at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 6720
  in method _statementlist at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 6740
  in method build at /Users/vrurg/perl6/share/perl6/site/sources/1F8979E66EC25897B7D5EADCEB5077EE1CA6873F (Perl6::Parser::Factory) line 1879
  in method build-tree at /Users/vrurg/perl6/share/perl6/site/sources/A533CF699C524EF0BC980B6E8378E5FA56EB7592 (Perl6::Parser) line 453
  in method to-tree at /Users/vrurg/perl6/share/perl6/site/sources/A533CF699C524EF0BC980B6E8378E5FA56EB7592 (Perl6::Parser) line 514
  in block <unit> at ./t.p6 line 17