Vendor dependencies for 0.3.0 release

vendor/derive_more/tests/index.rs

@@ -0,0 +1,20 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+#![allow(dead_code)] // some code is tested for type checking only
+
+#[cfg(not(feature = "std"))]
+extern crate alloc;
+
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
+use derive_more::Index;
+
+#[derive(Index)]
+struct MyVec(Vec<i32>);
+
+#[derive(Index)]
+struct Numbers {
+    #[index]
+    numbers: Vec<i32>,
+    useless: bool,
+}