[gcc r14-8572] gccrs: Add a regression test for unsafe module validation

[Arthur Cohen]

https://gcc.gnu.org/g:088e3b0b7af1b6a38057c8717227867831d00c5e

commit r14-8572-g088e3b0b7af1b6a38057c8717227867831d00c5e
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Tue Nov 21 19:34:36 2023 +0100

    gccrs: Add a regression test for unsafe module validation
    
    Add a new test to check for unsafe modules during AST validation pass.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/unsafe_module.rs: New test.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 gcc/testsuite/rust/compile/unsafe_module.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/testsuite/rust/compile/unsafe_module.rs b/gcc/testsuite/rust/compile/unsafe_module.rs
new file mode 100644
index 000000000000..74bc170be5b0
--- /dev/null
+++ b/gcc/testsuite/rust/compile/unsafe_module.rs
@@ -0,0 +1,2 @@
+unsafe mod toto {}
+// { dg-error "module cannot be declared unsafe" "" { target *-*-* } .-1 }