Parametric polymorphism: Difference between revisions
→{{header|Oforth}}
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| Node (x,l,r) -> Node (f x, map_tree f l, map_tree f r)</lang>
=={{header|Oforth}}==
{{omit from|Oforth|Oforth is nt statically-typed language}}
=={{header|Perl 6}}==
<lang perl6>role BinaryTree[::T] {
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