[COMMITTED 056/101] gccrs: Add regression test for const fn in trait

[arthur . cohen]

From: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>

Const fn declaration in trait declarations shall emit an error. This new
test highlight this behavior.

gcc/testsuite/ChangeLog:

        * rust/compile/const_trait_fn.rs: New test.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>
---
 gcc/testsuite/rust/compile/const_trait_fn.rs | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 gcc/testsuite/rust/compile/const_trait_fn.rs

diff --git a/gcc/testsuite/rust/compile/const_trait_fn.rs 
b/gcc/testsuite/rust/compile/const_trait_fn.rs
new file mode 100644
index 00000000000..cff2f5f096e
--- /dev/null
+++ b/gcc/testsuite/rust/compile/const_trait_fn.rs
@@ -0,0 +1,4 @@
+trait Osterkz {
+    const fn x();
+    // { dg-error "functions in traits cannot be declared const .E0379." "" { 
target *-*-* } .-1 }
+}
-- 
2.42.1