From @masak

<pmichaud> p6​: my Rat constant $r .= new(3,5); say $r; # should work
<p6eval> ..rakudo 763b85​: OUTPUT«===SORRY!===␤Default constructor only
takes named arguments␤»
<pmichaud> why is it looking at the Default constructor, I wonder?
<jnthn> pmichaud​: Maybe an initialization fail
<jnthn> pmichaud​: I mean...it doesn't call on Rat for some reason.
<pmichaud> anyway, seeing that I agree​: BUG
* masak submits rakudobug

From @ronaldxs

Just to note some similar examples that also seem to have problems that
may be useful for tests etc.​:

$ class C {has $.a}; my C constant $c .= new(​:a<red>);
use of uninitialized value of type Mu in string context in any <anon>
at src/gen/BOOTSTRAP.pm​:104

use of uninitialized value of type Mu in string context in any <anon>
at src/gen/BOOTSTRAP.pm​:104

class Foo {
  has $.a;

  method new ($self​: Str $string) {
  $self.bless(*, a => $string);
  }
}
my Foo constant $c .= new("abc");
say $c.perl;
say $c.WHAT;

Above program reveals that $c is incorrectly set to type Str.

@ronaldxs - Status changed from 'new' to 'open'

From @Mouq

Fixed in Rakudo commit​:

commit 2f7046f18b18067d77a6717f2157ec458215754f
Author​: Mouq <alexmoquin@​gmail.com>
Date​: Wed Feb 11 12​:25​:28 2015 -0500

  Add type info to constant decls. Fixes #​114506

Tests added to S04-declarations/constant.t in Roast commit​:

commit e650e931f0e8b6d5fb38afda445169d345de50b1
Author​: Mouq <alexmoquin@​gmail.com>
Date​: Wed Feb 11 12​:35​:39 2015 -0500

  Add tests for #​114506

Closing this ticket as resolved :)

On Sun Aug 19 17​:08​:48 2012, ronaldxs wrote​:

Just to note some similar examples that also seem to have problems that
may be useful for tests etc.​:

$ class C {has $.a}; my C constant $c .= new(​:a<red>);
use of uninitialized value of type Mu in string context in any <anon>
at src/gen/BOOTSTRAP.pm​:104

use of uninitialized value of type Mu in string context in any <anon>
at src/gen/BOOTSTRAP.pm​:104

class Foo {
has $.a;

method new ($self​: Str $string) {
$self.bless(*, a => $string);
}
}
my Foo constant $c .= new("abc");
say $c.perl;
say $c.WHAT;

Above program reveals that $c is incorrectly set to type Str.

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