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my $foo := 42; # declares $foo at compile time, binds it to immutable 
+42 at run-time
BEGIN say $foo; # (Any)
$foo = 99; # Cannot assign to an immutable value

my @foo := (42, $);
@foo[1] = 99;
say @foo; # (42 99)
@foo[0] = 99; # Cannot modify an immutable Int