placeholder vs. lexical variables

Folks,

I found this when I was playing w/ pugs.

pugs> { $^x }.(42)
42
pugs> { my $z; $^x }.(42)
*** Undeclared variable: "$^x"
     at <interactive> line 1, column 10-14

So far as I see s06, there's nothing wrong w/ the statement above.  I  
just want to make sure this is not a perl6 feature.

I found this when I tried

   { my %n; { %n{ $^n } ||= ($^n <= 2 ?? 1 !!  &?BLOCK($^n-1) +  &? 
BLOCK($^n-2)) }.($^n) }.(42)

This fails on pugs while

   -> $n { my %n; { %n{ $^n } ||= ($^n <= 2 ?? 1 !!  &?BLOCK($^n-1)  
+  &?BLOCK($^n-2)) }.($n) }.(42)

beautifully returns 267914296.

Dan the Yet Another Pugs Addict

• placeholder vs. lexical variables by Dan Kogai
• Re: placeholder vs. lexical variables by Audrey Tang