nr2.0: Add macros 2.0 resolution testcase.

gcc/testsuite/ChangeLog:

	* rust/compile/name_resolution10.rs: New test.

gcc/testsuite/rust/compile/name_resolution10.rs

@@ -0,0 +1,19 @@
+// { dg-options "-frust-name-resolution-2.0 -frust-compile-until=lowering" }
+
+#![feature(decl_macro)]
+
+pub mod foo {
+    pub mod bar {
+        pub mod baz {
+            // macros 2.0 get inserted in Ribs like items
+            pub macro boof() {}
+        }
+    }
+}
+
+#[macro_export]
+fn main() {
+    foo::bar::baz::boof!();
+    crate::foo::bar::baz::boof!();
+    self::foo::bar::baz::boof!();
+}