[gcc r14-8074] gccrs: Add a new regression test for issue 2665

[Arthur Cohen]

https://gcc.gnu.org/g:973e962ee5ca29535d1b2b9838256553abe05f1d

commit r14-8074-g973e962ee5ca29535d1b2b9838256553abe05f1d
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Mon Oct 23 17:16:25 2023 +0200

    gccrs: Add a new regression test for issue 2665
    
    Highlight issue 2665's fix for const with no value expression.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/issue-2665.rs: New test.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 gcc/testsuite/rust/compile/issue-2665.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gcc/testsuite/rust/compile/issue-2665.rs b/gcc/testsuite/rust/compile/issue-2665.rs
new file mode 100644
index 00000000000..3ee8e7b22ca
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-2665.rs
@@ -0,0 +1,6 @@
+fn main() {}
+
+#[cfg(FALSE)]
+impl X {
+    const Y: u8;
+}