[perl #65804] [BUG] 'sub' cannot be used as a routine name

[Carl Mäsak via RT]

This one seems fixed.

<masak> rakudo: sub sub($foo) { say "OH HAI" }; sub(1)
<p6eval> rakudo e02bc0: OUTPUT«OH HAI␤»
* masak closes #65804

I'd close, but it could perhaps use a spectest; assigning to KyleHa++.