Move /src/test to /tests

tests/ui/proc-macro/proc-macro-attributes.rs

@@ -0,0 +1,22 @@
+// aux-build:derive-b.rs
+
+#[macro_use]
+extern crate derive_b;
+
+#[B] //~ ERROR `B` is ambiguous
+     //~| WARN derive helper attribute is used before it is introduced
+     //~| WARN this was previously accepted
+#[C] //~ ERROR cannot find attribute `C` in this scope
+#[B(D)] //~ ERROR `B` is ambiguous
+        //~| WARN derive helper attribute is used before it is introduced
+        //~| WARN this was previously accepted
+#[B(E = "foo")] //~ ERROR `B` is ambiguous
+                //~| WARN derive helper attribute is used before it is introduced
+                //~| WARN this was previously accepted
+#[B(arbitrary tokens)] //~ ERROR `B` is ambiguous
+                       //~| WARN derive helper attribute is used before it is introduced
+                       //~| WARN this was previously accepted
+#[derive(B)]
+struct B;
+
+fn main() {}