[gcc r17-3080] gccrs: testsuite: Add regression test for Rust-GCC/gccrs#4116

https://gcc.gnu.org/g:fb133ead1c29ab3f60e2c9797ff61426e141e59b

commit r17-3080-gfb133ead1c29ab3f60e2c9797ff61426e141e59b
Author: Arthur Cohen <[email protected]>
Date:   Tue Jul 7 17:53:21 2026 +0200

    gccrs: testsuite: Add regression test for Rust-GCC/gccrs#4116
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/issue-4116.rs: New test.

Diff:
---
 gcc/testsuite/rust/compile/issue-4116.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/gcc/testsuite/rust/compile/issue-4116.rs b/gcc/testsuite/rust/compile/issue-4116.rs
new file mode 100644
index 000000000000..2741a6871977
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-4116.rs
@@ -0,0 +1,19 @@
+#![feature(no_core)]
+#![no_core]
+
+enum Foo {
+    Relaxed,
+    SeqCst,
+    StressedOut,
+}
+
+use Foo::{Relaxed, SeqCst, StressedOut};
+
+fn main() {
+    let a = (Relaxed, Relaxed);
+
+    match a {
+        (Relaxed, Relaxed) => {}
+        _ => {}
+    }
+}