From c30106c90665079f525129e344cc1c13e4db162b Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sun, 5 Jan 2020 17:42:03 -0500
Subject: [PATCH] add test case to cover already-solved bug

closes #2401
---
 test/stage1/behavior/union.zig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/test/stage1/behavior/union.zig b/test/stage1/behavior/union.zig
index d831b51b08..a977e31853 100644
--- a/test/stage1/behavior/union.zig
+++ b/test/stage1/behavior/union.zig
@@ -611,3 +611,12 @@ test "function call result coerces from tagged union to the tag" {
     S.doTheTest();
     comptime S.doTheTest();
 }
+
+test "0-sized extern union definition" {
+    const U = extern union {
+        a: void,
+        const f = 1;
+    };
+
+    expect(U.f == 1);
+}