From johan.viklund@gmail.com

class T {
  has $.thing = 'default';
  submethod BUILD {}
}

say T.new.thing; # Use of uninitialized value

When BUILD is removed it works.

--
Johan Viklund

From wolf.arthur@gmail.com

hello
first bug report so i'm not sure i'm doing this right.

so, perl6 -e ' class A { has $.a; }; my $a = A.new( a => 2 ); say $a.a '
this outputs 2 as expected

but :
perl6 -e ' class A { has $.a; submethod BUILD { say "OH HAI" } }; my $a =
A.new( a => 2 ); say $a.a '
outputs :
OH HAI
Use of uninitialized value

where it should output :
OH HAI
2

( I think )

Thanks a lot !
( is there some way I can follow / be warned on the resolution of this bug ?
)

--
Courage (et Bonne humeur|and Good humor)\.

From @jnthn

Merging these two duplicate tickets.

From @bbkr

On Kiev build​:

$ perl6 -e ' class A { has $.a; method BUILD { say "OH HAI" } }; my $a =
A.new( a => 2 ); say $a.a '
OH HAI
Any()

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

From @markjreed

rakudo​: class Foo { has $.bar = "baz"; }; say Foo.new.bar
<p6eval> rakudo 278366​: OUTPUT <baz>

rakudo​: class Foo { has $.bar = "baz"; submethod BUILD{}}; say Foo.new.bar
<p6eval> rakudo 278366​: OUTPUT <Any()>

Per S12​:
  Whether you write your own BUILD or not, at the end of the BUILD,
any default attribute values are implicitly copied into any attributes
that haven't otherwise been initialized.

--
Mark J. Reed <markjreed@​gmail.com>

From @moritz

Seems to be fixed now. A basic passing test is in
t/spec/S12-attributes/instance.t.

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