Translate constructor arguments for zero-sized tuple structs

This was preventing any side-effects from the expressions from
happening.

Fixes #28114

1 files changed, 21 insertions, 0 deletions

diff --git a/src/test/run-pass/zero-sized-tuple-struct.rs b/src/test/run-pass/zero-sized-tuple-struct.rs
new file mode 100644
index 00000000000..aaffdc4ec7c
--- /dev/null
+++ b/src/test/run-pass/zero-sized-tuple-struct.rs
@@ -0,0 +1,21 @@
+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(unused_assignments)]
+
+// Make sure that the constructor args are translated for zero-sized tuple structs
+
+struct Foo(());
+
+fn main() {
+    let mut a = 1;
+    Foo({ a = 2 });
+    assert_eq!(a, 2);
+}