From zefram@fysh.org

my $a = 3; my $c = \($a); say $c.WHICH; $a = 555; say $c.WHICH
Capture|(Int|3)
Capture|(Int|555)

The Capture's identity, as judged by .WHICH, is apparently changing.
That should never happen. To accurately reflect the object identity
that's in play here, the Capture's .WHICH ought to be something like
"Capture|(Scalar|47816222142984)". (Apropos recent discussion of Scalar,
this isn't to say that the Scalar should be available as an actual object;
it's just that the Scalar is the seat of the identity that needs to be
incorporated into the Capture's identity.)

-zefram

From @zoffixznet

On Wed, 17 Aug 2016 15​:42​:04 -0700, zefram@​fysh.org wrote​:

my $a = 3; my $c = \($a); say $c.WHICH; $a = 555; say $c.WHICH
Capture|(Int|3)
Capture|(Int|555)

The Capture's identity, as judged by .WHICH, is apparently changing.
That should never happen. To accurately reflect the object identity
that's in play here, the Capture's .WHICH ought to be something like
"Capture|(Scalar|47816222142984)". (Apropos recent discussion of Scalar,
this isn't to say that the Scalar should be available as an actual object;
it's just that the Scalar is the seat of the identity that needs to be
incorporated into the Capture's identity.)

-zefram

Thank you for the report. This is now fixed.

Fix​: rakudo/rakudo@4605d5219e
Tests​: Raku/roast@7cf30b225a

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

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