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type TT;
type {:datatype} Tree;
function {:constructor} leaf`0() : Tree;
function {:constructor} node`2(value:TT, children:TreeList) : Tree;
type {:datatype} TreeList;
function {:constructor} cons`2(car:Tree, cdr:TreeList) : TreeList;
function {:constructor} nil`0() : TreeList;
procedure foo()
{
var a: Tree;
var b: TreeList;
var x: TT;
assert value#node`2(node`2(x, nil`0())) == x;
assert children#node`2(node`2(x, nil`0())) == nil`0();
assert (cons`2(leaf`0(), nil`0()) != nil`0());
assert is#nil`0(nil`0());
assert is#node`2(leaf`0());
}
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