gccrs: Add multiple tests for non root proc macro

Add multiple tests to prevent regressions on procedural macros errors
when one is declared outside of the crate's top level.

gcc/testsuite/ChangeLog:

	* rust/compile/proc_macro_attribute_non_root_function.rs: New test.
	* rust/compile/proc_macro_attribute_non_root_method.rs: New test.
	* rust/compile/proc_macro_attribute_non_root_module.rs: New test.
	* rust/compile/proc_macro_derive_non_root_function.rs: New test.
	* rust/compile/proc_macro_derive_non_root_method.rs: New test.
	* rust/compile/proc_macro_derive_non_root_module.rs: New test.
	* rust/compile/proc_macro_non_root_function.rs: New test.
	* rust/compile/proc_macro_non_root_method.rs: New test.
	* rust/compile/proc_macro_non_root_module.rs: New test.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

gcc/testsuite/rust/compile/proc_macro_attribute_non_root_function.rs

@@ -0,0 +1,6 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+fn outer_function() {
+    #[proc_macro_attribute]
+    pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro_attribute.. must currently reside in the root of the crate" }
+}

gcc/testsuite/rust/compile/proc_macro_attribute_non_root_method.rs

@@ -0,0 +1,10 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+struct DummyStruct;
+
+impl DummyStruct {
+    pub fn method(self) {
+        #[proc_macro_attribute]
+        pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro_attribute.. must currently reside in the root of the crate" }
+    }
+}

gcc/testsuite/rust/compile/proc_macro_attribute_non_root_module.rs

@@ -0,0 +1,6 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+mod test_module {
+    #[proc_macro_attribute]
+    pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro_attribute.. must currently reside in the root of the crate" }
+}

gcc/testsuite/rust/compile/proc_macro_derive_non_root_function.rs

@@ -0,0 +1,6 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+fn outer_function() {
+    #[proc_macro_derive(SomeTrait)]
+    pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro_derive.. must currently reside in the root of the crate" }
+}

gcc/testsuite/rust/compile/proc_macro_derive_non_root_method.rs

@@ -0,0 +1,12 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+trait SomeTrait {}
+
+struct DummyStruct;
+
+impl DummyStruct {
+    pub fn method(self) {
+        #[proc_macro_derive(SomeTrait)]
+        pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro_derive.. must currently reside in the root of the crate" }
+    }
+}

gcc/testsuite/rust/compile/proc_macro_derive_non_root_module.rs

@@ -0,0 +1,6 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+mod test_module {
+    #[proc_macro_derive(SomeTrait)]
+    pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro_derive.. must currently reside in the root of the crate" }
+}

gcc/testsuite/rust/compile/proc_macro_non_root_function.rs

@@ -0,0 +1,6 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+fn outer_function() {
+    #[proc_macro]
+    pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro.. must currently reside in the root of the crate" }
+}

gcc/testsuite/rust/compile/proc_macro_non_root_method.rs

@@ -0,0 +1,10 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+struct DummyStruct;
+
+impl DummyStruct {
+    pub fn method(self) {
+        #[proc_macro]
+        pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro.. must currently reside in the root of the crate" }
+    }
+}

gcc/testsuite/rust/compile/proc_macro_non_root_module.rs

@@ -0,0 +1,6 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+mod test_module {
+    #[proc_macro]
+    pub fn non_root_function() {} // { dg-error "functions tagged with .#.proc_macro.. must currently reside in the root of the crate" }
+}