[perl #127600] return in anonymous function causes error

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Code sample:

my $anon = -> $x, $y {return $x * $y};

say $anon(3,7);

Produces this output:

Attempt to return outside of any Routine
  in block <unit> at simple.pl6 line 3


Since anonymous subroutine returns the product of the two numbers,
one would think that a "return" would be acceptable within the code.