Add tests for uniqueness of route macros

core/codegen/tests/ui-pass.rs

@@ -0,0 +1,5 @@
+#[test]
+fn ui() {
+    let t = trybuild::TestCases::new();
+    t.pass(format!("tests/ui-pass/*.rs"));
+}

core/codegen/tests/ui-pass/route-uniqueness-generated.rs

@@ -0,0 +1,27 @@
+#[macro_use] extern crate rocket;
+
+// Makes sure that the hashing of the proc macro's call site span
+// is enough, even if we're inside a declarative macro
+macro_rules! gen_routes {
+    () => {
+        #[get("/")]
+        fn index() -> &'static str {
+            "GET"
+        }
+
+        mod two {
+            #[get("/")]
+            fn index() -> &'static str {
+                "GET"
+            }
+        }
+    }
+}
+
+gen_routes!();
+
+mod module {
+    gen_routes!();
+}
+
+fn main() {}

core/codegen/tests/ui-pass/route-uniqueness.rs

@@ -0,0 +1,18 @@
+#[macro_use] extern crate rocket;
+
+#[get("/")]
+fn index() -> &'static str {
+    "GET"
+}
+
+mod module {
+    // This one has all the same macro inputs, and we need it to
+    // generate a crate-wide unique identifier for the macro it
+    // defines.
+    #[get("/")]
+    pub fn index() -> &'static str {
+        "whatever"
+    }
+}
+
+fn main() {}