[perl #68138] Rakudo tries to call role-parameter typename as a sub when using 'does' with a parameterized RHS && missing line# in the error

[Will Coleda via RT]

On Sun Aug 02 14:02:30 2009, eternal...@gmail.com wrote:
> This code fails. Moritz believes it to be due to T not being bound when 
> Positional[T] appears. Also, the error has no line number.
> 
> role TreeNode[::T] does Positional[T] {
>       has TreeNode[T] @!children handles 'postcircumfix:<[ ]>';
>       has T $.data is rw;
> }
> my $tree = TreeNode[Int].new;
> $tree.data = 3;
> $tree[0] = TreeNode[Int].new;
> $tree[1] = TreeNode[Int].new;
> $tree[0].data = 1;
> $tree[1].data = 4;
> .say for $tree.data, $tree[0,1]>>.data;

Current failure mode is:

Cannot call a method on type variable T
  in any find_method at src/gen/Metamodel.pm:282
  in <anon> at src/gen/Metamodel.pm:1614
  in <anon> at src/gen/Metamodel.pm:1610
  in any accepts_type at src/gen/Metamodel.pm:1608
  in method at_pos at src/gen/CORE.setting:5858
  in method at_pos at src/gen/CORE.setting:1252
  in method postcircumfix:<[ ]> at src/gen/CORE.setting:1211
  in method postcircumfix:<[ ]> at src/gen/CORE.setting:196
  in block <anon> at foo.pl:7


-- 
Will "Coke" Coleda