Meta-attribute trait

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use v6; use Test; plan 1; role crud { has Bool $.crud is default(True); } multi trait_mod:<is>(Attribute $a, crud, $arg) { $a.container.VAR does crud($arg); } class Foo { has $.bar is rw; has $.baz is rw is crud(True); } # Ok pass my $foo = Foo.new(); is $foo.baz.crud, True, 'Trait meta-attribute is properly set'; # No problem on this one since it doesn't "crud" $foo.bar = 123456789; say $foo; # Cannot modify an immutable Scalar+{crud} (Scalar+{crud}.new(crud => Bool::True)) # in block <unit> at t/08-attribute-trait.t line 33 $foo.baz = 'so what?';
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