diff --git a/test/stage1/behavior/tuple.zig b/test/stage1/behavior/tuple.zig
index 13d3d05681..686a9ad83e 100644
--- a/test/stage1/behavior/tuple.zig
+++ b/test/stage1/behavior/tuple.zig
@@ -15,4 +15,42 @@ test "tuple concatenation" {
     };
     S.doTheTest();
     comptime S.doTheTest();
+
+    const T = struct {
+        fn consume_tuple(tuple: var, len: usize) void {
+            expect(tuple.len == len);
+        }
+
+        fn doTheTest() void {
+            const t1 = .{};
+
+            var rt_var: u8 = 42;
+            const t2 = .{rt_var} ++ .{};
+
+            expect(t2.len == 1);
+            expect(t2.@"0" == rt_var);
+            expect(t2.@"0" == 42);
+            expect(&t2.@"0" != &rt_var);
+
+            consume_tuple(t1 ++ t1, 0);
+            consume_tuple(.{} ++ .{}, 0);
+            consume_tuple(.{0} ++ .{}, 1);
+            consume_tuple(.{0} ++ .{1}, 2);
+            consume_tuple(.{0, 1, 2} ++ .{u8, 1, noreturn}, 6);
+            consume_tuple(t2 ++ t1, 1);
+            consume_tuple(t1 ++ t2, 1);
+            consume_tuple(t2 ++ t2, 2);
+            consume_tuple(.{rt_var} ++ .{}, 1);
+            consume_tuple(.{rt_var} ++ t1, 1);
+            consume_tuple(.{} ++ .{rt_var}, 1);
+            consume_tuple(t2 ++ .{void}, 2);
+            consume_tuple(t2 ++ .{0}, 2);
+            consume_tuple(.{0} ++ t2, 2);
+            consume_tuple(.{void} ++ t2, 2);
+            consume_tuple(.{u8} ++ .{rt_var} ++ .{true}, 3);
+        }
+    };
+
+    T.doTheTest();
+    comptime T.doTheTest();
 }