From @LLFourn

MyMod.pm

class Foo {}
#Foo aliased to Bar
sub EXPORT(|){ { 'Bar' => Foo } }

main.pl

use lib 'lib';
use MyMod;

my class Baz {
  has Bar $.bar;
}

sub test(Bar $) { say "works!" }

test(Bar.new); #->works!

Baz.new(bar => Bar.new );
#!Type check failed in assignment to '$!bar'; expected 'Foo' but got 'Foo'

perl6 -v
This is perl6 version 2015.07.1-12-g174049f built on MoarVM version 2015.07

From @jnthn

On Wed Jul 29 01​:22​:48 2015, lloyd.fourn@​gmail.com wrote​:

MyMod.pm
-----
class Foo {}
#Foo aliased to Bar
sub EXPORT(|){ { 'Bar' => Foo } }

main.pl
----------
use lib 'lib';
use MyMod;

my class Baz {
has Bar $.bar;
}

sub test(Bar $) { say "works!" }

test(Bar.new); #->works!

Baz.new(bar => Bar.new );
#!Type check failed in assignment to '$!bar'; expected 'Foo' but got 'Foo'

perl6 -v
This is perl6 version 2015.07.1-12-g174049f built on MoarVM version 2015.07

Fixed, and test added in S11-modules/export.t.

The RT System itself - Status changed from 'new' to 'open'

@jnthn - Status changed from 'open' to 'resolved'