Parametric polymorphism: Difference between revisions
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=={{header|Raku}}==
(formerly Perl 6)
{{works with|Rakudo|2020.08.1}}
<lang perl6>role BinaryTree[::T] {
has T $.value;
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$it.replace-all(42);
say $it
{{out}}
<pre>IntTree.new(value => 42, left => IntTree.new(value => 42, left => BinaryTree[T], right => BinaryTree[T]), right => IntTree.new(value => 42, left => BinaryTree[T], right => BinaryTree[T]))</pre>
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