[perl #62162] Problem when instantiating a class which has an argument typed as a class which loads a grammar in Rakudo

[Carl Mäsak]

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The following three correct Perl 6 modules give a runtime error in
Rakudo r35336.

$ cat CGI.pm
use v6;
use URI;

class CGI {
    has URI $.uri;
}

$ cat URI.pm
use v6;

class URI;

use URI::Grammar;

$ cat URI/Grammar.pm
use v6;
grammar URI::Grammar {
}

$ perl6 -e 'use CGI; CGI.new'
Method 'item' not found for invocant of class 'FixedPMCArray'
[...]

The fact that the last file contains 'grammar' is irrelevant; 'class'
gives the same error. The relative order of 'class URI' and 'use
URI::Grammar' is also irrelevant.

These things make the problem go away:

* Removing the 'URI' typing of the $.uri attribute in CGI.pm.
* Making 'class URI' use braces instead of a semicolon in URI.pm.
* Removing the dependency on URI::Grammar in URI.pm.