From the.ashleydev+rt.cpan.org@gmail.com

(11​:17) < TimToady> m​: sub foo(​::T $f, :​:T $g) { say T }; foo(1,"foo")
(11​:17) <+camelia> rakudo-moar 3607d7​: OUTPUT«(Str)␤»
(11​:18) < TimToady> that should probably parsefail as a redeclaration of T

http://irclog.perlgeek.de/perl6/2015-02-26#i_10185616

Note the following discussion where similar cases are caught by the type checker just not the redeclaration of :​:T.

From @Mouq

This bug was fixed in Rakudo commit​:

commit c8ac15be78ea166ece522b239c7f5899d2e373b7
Author​: Moritz Lenz <moritz@​faui2k3.org>
Date​: Fri Feb 27 06​:53​:44 2015 +0100

  Throw redeclaration error for duplicate type capture

Tests were added in Roast commit​:

commit 9c177595c2c565d21d980c79067608d98250cc67
Author​: TimToady <larry@​wall.org>
Date​: Thu Feb 26 11​:38​:58 2015 -0800

  add tests for dup parameter names including :​:T

Closing this ticket as resolved :)

On Thu Feb 26 11​:26​:57 2015, the.ashleydev+rt.cpan.org@​gmail.com wrote​:

(11​:17) < TimToady> m​: sub foo(​::T $f, :​:T $g) { say T }; foo(1,"foo")
(11​:17) <+camelia> rakudo-moar 3607d7​: OUTPUT«(Str)␤»
(11​:18) < TimToady> that should probably parsefail as a redeclaration
of T

http://irclog.perlgeek.de/perl6/2015-02-26#i_10185616

Note the following discussion where similar cases are caught by the
type checker just not the redeclaration of :​:T.

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

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