tests: Re-add macro nr2.0 test cases

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!();
+}

gcc/testsuite/rust/compile/name_resolution6.rs

@@ -0,0 +1,28 @@
+// { dg-options "-frust-name-resolution-2.0 -frust-compile-until=lowering" }
+
+pub mod foo {
+    pub mod bar {
+        pub mod baz {
+            pub mod qux {
+                #[macro_export]
+                macro_rules! foo {
+                    (one) => {};
+                }
+
+                pub fn foo() {}
+            }
+        }
+
+        fn f() {
+            fn inner() {
+                macro_rules! foo {
+                    (two) => {};
+                }
+
+                foo!(two); // ok, textual scope
+                crate::foo!(one); // ok, path res
+                super::super::foo!(one); // ok, path res
+            }
+        }
+    }
+}

gcc/testsuite/rust/compile/name_resolution8.rs

@@ -0,0 +1,26 @@
+// { dg-options "-frust-name-resolution-2.0" }
+
+// check that macros by example get exported to the crate's root with #[macro_export]
+pub mod foo {
+    pub mod bar {
+        pub mod baz {
+            pub mod qux {
+				#[macro_export]
+                macro_rules! foo {
+                    (one) => {};
+                }
+            }
+        }
+    }
+}
+
+crate::foo!(one); // ok
+foo!(one); // ok
+
+mod a {
+	mod b {
+		mod c {
+			super::super::super::foo!(one); // ok
+		}
+	}
+}