Vendor things

third-party/vendor/overload/tests/unary.rs

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+extern crate overload;
+use overload::overload;
+use std::ops;
+
+#[derive(PartialEq, Debug)]
+struct A(i32);
+
+#[derive(PartialEq, Debug)]
+struct B(i32);
+
+overload!(- (a: A) -> B { B(-a.0) });
+#[test]
+fn neg() {
+    assert_eq!(-A(3), B(-3));
+}
+
+overload!(! (a: A) -> B { B(!a.0) });
+#[test]
+fn not() {
+    assert_eq!(!A(3), B(!3));
+}