[gcc r14-7835] gccrs: Add tests for non function proc_macro_attribute

[Arthur Cohen]

https://gcc.gnu.org/g:3c1cc1190a23f6dc9c5028e1b92e7bbb85651ac3

commit r14-7835-g3c1cc1190a23f6dc9c5028e1b92e7bbb85651ac3
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Fri Jul 21 14:03:10 2023 +0200

    gccrs: Add tests for non function proc_macro_attribute
    
    Add a bunch of test case to avoid regressions on proc_macro_attribute
    attribute error messages.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/proc_macro_attribute_non_function.rs: New test.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 .../compile/proc_macro_attribute_non_function.rs   | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/gcc/testsuite/rust/compile/proc_macro_attribute_non_function.rs b/gcc/testsuite/rust/compile/proc_macro_attribute_non_function.rs
new file mode 100644
index 00000000000..0e88bbebacc
--- /dev/null
+++ b/gcc/testsuite/rust/compile/proc_macro_attribute_non_function.rs
@@ -0,0 +1,58 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+mod inner {
+    struct InnerStruct;
+}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+type AliasedType = inner::InnerStruct;
+
+// { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" "" { target *-*-* } .+1 }
+#[proc_macro_attribute]
+use inner::InnerStruct;
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+struct MyStruct;
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+struct MyCurlyStruct {
+    member: usize,
+}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+struct MyTupleStruct(usize);
+
+#[proc_macro_attribute]
+// { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" "" { target *-*-* } .-1 }
+extern crate my_extern_crate; // { dg-error "unknown crate .my_extern_crate." }
+                              // { dg-error "failed to locate crate .my_extern_crate." "" { target *-*-* } .-1 }
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+mod my_module {}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+enum MyEnum {}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+union MyUnion {
+    f1: u32,
+    f2: f32,
+}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+const MY_CONST_STR: &str = "my_string";
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+static MY_STATIC_USIZE: usize = 10;
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+trait MyTrait {}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+impl MyStruct {}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+impl MyTrait for MyStruct {}
+
+#[proc_macro_attribute] // { dg-error "the .#.proc_macro_attribute.. attribute may only be used on bare functions" }
+extern "C" {}