Add regression test for issue #345.

lib/tests/responder_lifetime-issue-345.rs

@@ -0,0 +1,31 @@
+#![feature(plugin, custom_derive)]
+#![plugin(rocket_codegen)]
+#![allow(dead_code)] // This test is only here so that we can ensure it compiles.
+
+extern crate rocket;
+
+use rocket::State;
+use rocket::response::{self, Responder};
+
+struct SomeState;
+
+pub struct CustomResponder<'r, R> {
+    responder: R,
+    state: &'r SomeState,
+}
+
+impl<'r, R: Responder<'r>> Responder<'r> for CustomResponder<'r, R> {
+    fn respond_to(self, _: &rocket::Request) -> response::Result<'r> {
+        unimplemented!()
+    }
+}
+
+#[get("/unit_state")]
+fn unit_state(state: State<SomeState>) -> CustomResponder<()> {
+    CustomResponder { responder: (), state: state.inner() }
+}
+
+#[get("/string_state")]
+fn string_state(state: State<SomeState>) -> CustomResponder<String> {
+    CustomResponder { responder: "".to_string(), state: state.inner() }
+}