[gcc r16-2940] gccrs: Add test case to show issue is fixed

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:1420d244ee2e820e93a9538096fe2f1fafc6ff88

commit r16-2940-g1420d244ee2e820e93a9538096fe2f1fafc6ff88
Author: Philip Herron <herron.phi...@googlemail.com>
Date:   Fri Jul 18 16:11:59 2025 +0100

    gccrs: Add test case to show issue is fixed
    
    Fixes Rust-GCC#3524
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/issue-3524.rs: New test.
    
    Signed-off-by: Philip Herron <herron.phi...@googlemail.com>

Diff:
---
 gcc/testsuite/rust/compile/issue-3524.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gcc/testsuite/rust/compile/issue-3524.rs 
b/gcc/testsuite/rust/compile/issue-3524.rs
new file mode 100644
index 000000000000..62c8c3512747
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-3524.rs
@@ -0,0 +1,9 @@
+struct A {}
+// { dg-warning "struct is never constructed" "" { target *-*-* } .-1 }
+
+impl A {
+    fn main() {}
+    // { dg-warning "associated function is never used: .main." "" { target 
*-*-* } .-1 }
+}
+
+fn main() {}