rustc: Fix x86 ffi for empty struct arguments

1 files changed, 23 insertions, 0 deletions

diff --git a/src/rt/rust_test_helpers.c b/src/rt/rust_test_helpers.c
index ee328e6cdb5..4d5b95155ca 100644
--- a/src/rt/rust_test_helpers.c
+++ b/src/rt/rust_test_helpers.c
@@ -126,6 +126,29 @@ rust_dbg_extern_identity_TwoDoubles(struct TwoDoubles u) {
     return u;
 }
 
+struct ManyInts {
+    int8_t arg1;
+    int16_t arg2;
+    int32_t arg3;
+    int16_t arg4;
+    int8_t arg5;
+    struct TwoU8s arg6;
+};
+
+struct Empty {
+};
+
+void
+rust_dbg_extern_empty_struct(struct ManyInts v1, struct Empty e, struct ManyInts v2) {
+    assert(v1.arg1 == v2.arg1 + 1);
+    assert(v1.arg2 == v2.arg2 + 1);
+    assert(v1.arg3 == v2.arg3 + 1);
+    assert(v1.arg4 == v2.arg4 + 1);
+    assert(v1.arg5 == v2.arg5 + 1);
+    assert(v1.arg6.one == v2.arg6.one + 1);
+    assert(v1.arg6.two == v2.arg6.two + 1);
+}
+
 intptr_t
 rust_get_test_int() {
   return 1;