Vendor dependencies for 0.3.0 release

vendor/derive_more/tests/sum.rs

@@ -0,0 +1,34 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+#![allow(dead_code)] // some code is tested for type checking only
+
+use derive_more::Sum;
+
+#[derive(Sum)]
+struct MyInts(i32, i64);
+
+// `Add` implementation is required for `Sum`.
+impl ::core::ops::Add for MyInts {
+    type Output = MyInts;
+    #[inline]
+    fn add(self, rhs: MyInts) -> MyInts {
+        MyInts(self.0.add(rhs.0), self.1.add(rhs.1))
+    }
+}
+
+#[derive(Sum)]
+struct Point2D {
+    x: i32,
+    y: i32,
+}
+
+// `Add` implementation is required for `Sum`.
+impl ::core::ops::Add for Point2D {
+    type Output = Point2D;
+    #[inline]
+    fn add(self, rhs: Point2D) -> Point2D {
+        Point2D {
+            x: self.x.add(rhs.x),
+            y: self.y.add(rhs.y),
+        }
+    }
+}