Allow returning tuple in expression form

crates/luaify/src/generate.rs

@@ -523,7 +523,7 @@ fn generate_expr_tuple(f: &mut Formatter, tuple: &ExprTuple, cx: Context) -> Res
             f.write("nil");
             Ok(())
         }
-        _ if cx.is_multi_expr() => generate_punctuated_expr(f, &tuple.elems),
+        _ if cx.is_ret() || cx.is_multi_expr() => generate_punctuated_expr(f, &tuple.elems),
         _ => syn_error!(tuple, "expected single-valued expression"),
     }
 }