testsuite: Adds test from issue 1245

Added the test from the issue 1245.

Fixes GCC-Rust/gccrs#1245

gcc/testsuite/ChangeLog:

	* rust/execute/issue-1245.rs: New test.

Signed-off-by: lenny.chiadmi-delage <[email protected]>

Author: Villosse

gcc/testsuite/rust/execute/issue-1245.rs

@@ -0,0 +1,31 @@
+// { dg-output "minus two!\r*\nelse\r*\n" }
+extern "C" {
+    fn printf(s: *const i8, ...);
+}
+
+fn foo(x: i32) {
+    match x {
+        -2 => {
+            let a = "minus two!\n\0";
+            let b = a as *const str;
+            let c = b as *const i8;
+            unsafe {
+                printf(c);
+            }
+        }
+        _ => {
+            let a = "else\n\0";
+            let b = a as *const str;
+            let c = b as *const i8;
+            unsafe {
+                printf(c);
+            }
+        }
+    }
+}
+
+fn main() -> i32 {
+    foo(-2);
+    foo(2);
+    0
+}