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import std.stdio;
import std.container;
 
class TestClass {
	this(int v_) {
		v = v_;
	}
	int v;
}
 
void main() {
 
	auto rb = redBlackTree!(TestClass *)();
	TestClass c1 = new TestClass(1);
	TestClass c2 = new TestClass(2);
 
	rb.insert(c1);
	rb.insert(c2);
 
	foreach (TestClass *t; rb)
		writeln(t.v);
}

prog.d:18: error: template std.container.RedBlackTree!(TestClass*).RedBlackTree.stableInsert cannot deduce function from argument types !()(TestClass), candidates are:
/usr/include/d/4.9/std/container.d:5955: note: std.container.RedBlackTree!(TestClass*).RedBlackTree.stableInsert(Stuff)(Stuff stuff) if (isImplicitlyConvertible!(Stuff, Elem))
/usr/include/d/4.9/std/container.d:5974: note: std.container.RedBlackTree!(TestClass*).RedBlackTree.stableInsert(Stuff)(Stuff stuff) if (isInputRange!Stuff && isImplicitlyConvertible!(ElementType!Stuff, Elem))
prog.d:19: error: template std.container.RedBlackTree!(TestClass*).RedBlackTree.stableInsert cannot deduce function from argument types !()(TestClass), candidates are:
/usr/include/d/4.9/std/container.d:5955: note: std.container.RedBlackTree!(TestClass*).RedBlackTree.stableInsert(Stuff)(Stuff stuff) if (isImplicitlyConvertible!(Stuff, Elem))
/usr/include/d/4.9/std/container.d:5974: note: std.container.RedBlackTree!(TestClass*).RedBlackTree.stableInsert(Stuff)(Stuff stuff) if (isInputRange!Stuff && isImplicitlyConvertible!(ElementType!Stuff, Elem))

Standard output is empty