[gcc/devel/rust/master] tests: add regression tests for more macro expansions

[Thomas Schwinge <tschwinge@gcc.gnu.org>]

https://gcc.gnu.org/g:3ce22036e48a4f8805440abcd291ecd35d2ca468

commit 3ce22036e48a4f8805440abcd291ecd35d2ca468
Author: liushuyu <liushuyu011@gmail.com>
Date:   Tue Jul 19 15:38:21 2022 -0600

    tests: add regression tests for more macro expansions

Diff:
---
 gcc/testsuite/rust/compile/{xfail => }/macro_return.rs |  2 +-
 gcc/testsuite/rust/compile/torture/macro_as_expr.rs    | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/rust/compile/xfail/macro_return.rs b/gcc/testsuite/rust/compile/macro_return.rs
similarity index 72%
rename from gcc/testsuite/rust/compile/xfail/macro_return.rs
rename to gcc/testsuite/rust/compile/macro_return.rs
index c335929cfeb..8b06f875cc0 100644
--- a/gcc/testsuite/rust/compile/xfail/macro_return.rs
+++ b/gcc/testsuite/rust/compile/macro_return.rs
@@ -1,4 +1,4 @@
-// { dg-excess-errors "...." { xfail *-*-*-* *-*-* } }
+// { dg-additional-options "-w" }
 
 macro_rules! add {
     ($a:expr) => { $a };
diff --git a/gcc/testsuite/rust/compile/torture/macro_as_expr.rs b/gcc/testsuite/rust/compile/torture/macro_as_expr.rs
new file mode 100644
index 00000000000..b0084e7b466
--- /dev/null
+++ b/gcc/testsuite/rust/compile/torture/macro_as_expr.rs
@@ -0,0 +1,14 @@
+// { dg-additional-options "-w" }
+
+macro_rules! add {
+    ($a:expr) => { $a };
+    ($a:expr, $($b:expr),+) => { $a + add!($($b),*) }
+}
+
+fn main() -> i32 {
+    if add!(add!(1, 2)) > add!(5) {
+        add!(1, add!(2, 3), add!(4))
+    } else {
+        add!(5, add!(6, 7), add!(8), 9) + 10
+    }
+}