fix tagged union with all void payloads but meaningful tag

closes #1322

2 files changed, 20 insertions, 0 deletions

diff --git a/test/behavior.zig b/test/behavior.zig
index 869024f296..3223131d08 100644
--- a/test/behavior.zig
+++ b/test/behavior.zig
@@ -10,6 +10,7 @@ comptime {
     _ = @import("cases/bool.zig");
     _ = @import("cases/bugs/1111.zig");
     _ = @import("cases/bugs/1277.zig");
+    _ = @import("cases/bugs/1322.zig");
     _ = @import("cases/bugs/1381.zig");
     _ = @import("cases/bugs/1421.zig");
     _ = @import("cases/bugs/1442.zig");
diff --git a/test/cases/bugs/1322.zig b/test/cases/bugs/1322.zig
new file mode 100644
index 0000000000..2de92191ec
--- /dev/null
+++ b/test/cases/bugs/1322.zig
@@ -0,0 +1,19 @@
+const std = @import("std");
+
+const B = union(enum) {
+    c: C,
+    None,
+};
+
+const A = struct {
+    b: B,
+};
+
+const C = struct {};
+
+test "tagged union with all void fields but a meaningful tag" {
+    var a: A = A{ .b = B{ .c = C{} } };
+    std.debug.assert(@TagType(B)(a.b) == @TagType(B).c);
+    a = A{ .b = B.None };
+    std.debug.assert(@TagType(B)(a.b) == @TagType(B).None);
+}