[gcc r14-9107] gccrs: Add testcase for matches!() macro

[Arthur Cohen <cohenarthur@gcc.gnu.org>]

https://gcc.gnu.org/g:4cabeacc388b4ec8dfa41bf9c99b0dbd87d4b1f4

commit r14-9107-g4cabeacc388b4ec8dfa41bf9c99b0dbd87d4b1f4
Author: Arthur Cohen <arthur.cohen@embecosm.com>
Date:   Tue Feb 6 17:01:46 2024 +0100

    gccrs: Add testcase for matches!() macro
    
    This adds a testcase for issue #2129.
    
    gcc/testsuite/ChangeLog:
    
            * rust/execute/torture/matches_macro.rs: New test.

Diff:
---
 .../rust/execute/torture/matches_macro.rs          | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/gcc/testsuite/rust/execute/torture/matches_macro.rs b/gcc/testsuite/rust/execute/torture/matches_macro.rs
new file mode 100644
index 000000000000..7b61570727d8
--- /dev/null
+++ b/gcc/testsuite/rust/execute/torture/matches_macro.rs
@@ -0,0 +1,30 @@
+macro_rules! matches {
+    ($expression:expr, $($pattern:pat)|+ $( if $guard:expr ),*) => {
+        match $expression {
+            $($pattern)|+ => true,
+            _ => false,
+        }
+    }
+}
+
+pub fn should_match() -> bool {
+    matches!(1, 1)
+}
+
+pub fn shouldnt() -> bool {
+    matches!(1, 2)
+}
+
+fn main() -> i32 {
+    let mut retval = 2;
+
+    if should_match() {
+        retval -= 1;
+    }
+
+    if !shouldnt() {
+        retval -= 1;
+    }
+
+    retval
+}