[gcc r15-8420] gccrs: add test case to show impl block on ! works

[Arthur Cohen]

https://gcc.gnu.org/g:5e416545361ab39fcced3b2c153a93887615fd64

commit r15-8420-g5e416545361ab39fcced3b2c153a93887615fd64
Author: Philip Herron <herron.philip@googlemail.com>
Date:   Thu Sep 26 15:25:21 2024 +0100

    gccrs: add test case to show impl block on ! works
    
    The resolution with ! was fixed in: 09cfe530f9c this adds a
    test case to show the other issue is also fixed.
    
    Fixes #2951
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/nr2/exclude: nr2 is crashing here
            * rust/compile/issue-2951.rs: New test.
    
    Signed-off-by: Philip Herron <herron.philip@googlemail.com>

Diff:
---
 gcc/testsuite/rust/compile/issue-2951.rs | 13 +++++++++++++
 gcc/testsuite/rust/compile/nr2/exclude   |  1 +
 2 files changed, 14 insertions(+)

diff --git a/gcc/testsuite/rust/compile/issue-2951.rs b/gcc/testsuite/rust/compile/issue-2951.rs
new file mode 100644
index 000000000000..d30a3bf2adf1
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-2951.rs
@@ -0,0 +1,13 @@
+#[lang = "sized"]
+pub trait Sized {}
+
+#[lang = "clone"]
+pub trait Clone: Sized {
+    fn clone(&self) -> Self;
+}
+
+impl Clone for ! {
+    fn clone(&self) -> Self {
+        *self
+    }
+}
diff --git a/gcc/testsuite/rust/compile/nr2/exclude b/gcc/testsuite/rust/compile/nr2/exclude
index 50781e56b85e..c30af607edb4 100644
--- a/gcc/testsuite/rust/compile/nr2/exclude
+++ b/gcc/testsuite/rust/compile/nr2/exclude
@@ -253,3 +253,4 @@ issue-3139-1.rs
 issue-3139-2.rs
 issue-3139-3.rs
 issue-3036.rs
+issue-2951.rs