[gcc r14-7836] gccrs: Add tests for non function proc_macro_derive

[Arthur Cohen]

https://gcc.gnu.org/g:e58650e6df390e71e7ce880c6bc895a4c4930e25

commit r14-7836-ge58650e6df390e71e7ce880c6bc895a4c4930e25
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Fri Jul 21 14:18:12 2023 +0200

    gccrs: Add tests for non function proc_macro_derive
    
    Add a bunch of test cases to avoid regressions on proc_macro_derive
    attribute errors when placed on any non function item.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/proc_macro_derive_non_function.rs: New test.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 .../rust/compile/proc_macro_derive_non_function.rs | 60 ++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/gcc/testsuite/rust/compile/proc_macro_derive_non_function.rs b/gcc/testsuite/rust/compile/proc_macro_derive_non_function.rs
new file mode 100644
index 00000000000..7cb4c0b883c
--- /dev/null
+++ b/gcc/testsuite/rust/compile/proc_macro_derive_non_function.rs
@@ -0,0 +1,60 @@
+// { dg-additional-options "-frust-crate-type=proc-macro" }
+
+trait ToDerive {}
+
+mod inner {
+    struct InnerStruct;
+}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+type AliasedType = inner::InnerStruct;
+
+// { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" "" { target *-*-* } .+1 }
+#[proc_macro_derive(ToDerive)]
+use inner::InnerStruct;
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+struct MyStruct;
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+struct MyCurlyStruct {
+    member: usize,
+}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+struct MyTupleStruct(usize);
+
+#[proc_macro_derive(ToDerive)]
+// { dg-error "the .#.proc_macro_derive.. 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_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+mod my_module {}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+enum MyEnum {}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+union MyUnion {
+    f1: u32,
+    f2: f32,
+}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+const MY_CONST_STR: &str = "my_string";
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+static MY_STATIC_USIZE: usize = 10;
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+trait MyTrait {}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+impl MyStruct {}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+impl MyTrait for MyStruct {}
+
+#[proc_macro_derive(ToDerive)] // { dg-error "the .#.proc_macro_derive.. attribute may only be used on bare functions" }
+extern "C" {}