[gcc r14-8588] gccrs: Add a regression test for function body check

[Arthur Cohen]

https://gcc.gnu.org/g:a7991de39ff3ef42cd48bb460a02134af73d7b9d

commit r14-8588-ga7991de39ff3ef42cd48bb460a02134af73d7b9d
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Thu Nov 23 14:08:50 2023 +0100

    gccrs: Add a regression test for function body check
    
    Function body check emit an error message when a required function body
    is missing.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/functions_without_body.rs: New test.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 .../rust/compile/functions_without_body.rs          | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/gcc/testsuite/rust/compile/functions_without_body.rs b/gcc/testsuite/rust/compile/functions_without_body.rs
new file mode 100644
index 000000000000..36ddea52161e
--- /dev/null
+++ b/gcc/testsuite/rust/compile/functions_without_body.rs
@@ -0,0 +1,21 @@
+struct MyStruct;
+
+trait X {}
+
+fn test_a();
+// { dg-error "free function without a body" "" { target *-*-* } .-1 }
+
+impl MyStruct {
+    fn test_b<T>()
+    // { dg-error "associated function in .impl. without body" "" { target *-*-* } .-1 }
+    where
+        T: Copy;
+
+    fn test_c<T>();
+    // { dg-error "associated function in .impl. without body" "" { target *-*-* } .-1 }
+}
+
+impl X for MyStruct {
+    fn test_d();
+    // { dg-error "associated function in .impl. without body" "" { target *-*-* } .-1 }
+}