build: vendor Rust crate dependencies

third_party/crates/anyhow-1.0.104/tests/ui/no-impl.rs

@@ -0,0 +1,8 @@
+use anyhow::anyhow;
+
+#[derive(Debug)]
+struct Error;
+
+fn main() {
+    let _ = anyhow!(Error);
+}