From @masak

<masak> rakudo​: sub foo { my $a = 5; say $^a }; foo(7)
<p6eval> rakudo c01555​: OUTPUT«5␤»
<moritz_> that looks... wrong
<masak> aye.
<masak> bug reporting time.

Compile-time error, perhaps?

From @bbkr

[16​:19] <bbkr> rakudo​: sub foo { my $a = 5; say $^a }; foo(7); #
http://rt.perl.org/rt3/Ticket/Display.html?id=64310 looks like solved,
but I don't know in which S* look for test cases
[16​:19] <p6eval> rakudo c4857a​: OUTPUT«Cannot assign to readonly
value␤current instr.​: '&die' pc 17391 (src/builtins/Junction.pir​:410)␤»

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

From @kyleha

This is an automatically generated mail to inform you that tests are now available in t/spec/S06-signature/positional-placeholders.t

commit 4a6027c4e5adc0ce1b7e83fcd0581e9673c45545
Author​: moritz <moritz@​c213334d-75ef-0310-aa23-eaa082d1ae64>
Date​: Mon May 31 19​:38​:19 2010 +0000

  [t/spec] test for RT #​64310, $^a after my $a
 
  git-svn-id​: http://svn.pugscode.org/pugs@&#8203;31030 c213334d-75ef-0310-aa23-eaa082d1ae64

diff --git a/t/spec/S06-signature/positional-placeholders.t b/t/spec/S06-signature/positional-placeholders.t
index 4385a07..5584805 100644
--- a/t/spec/S06-signature/positional-placeholders.t
+++ b/t/spec/S06-signature/positional-placeholders.t
@@ -1,7 +1,7 @@
 use v6;
 use Test;
 
-plan 7;
+plan 8;
 
 #L<S06/Placeholder variables/>
 
@@ -29,6 +29,9 @@ non_twigil(5);
 eval_dies_ok( ' {$foo; $^foo;}(1) ',
 'A non-twigil variable should not precede a corresponding twigil variable' );
 
+# RT #64310
+eval_dies_ok ' {my $foo; $^foo;}(1) ', 'my $foo; $^foo; is an illegal redeclaration';
+
 # RT #74778
 {
     my $tracker = '';

From @moritz

Works now, test pass.

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