Sema: allow equality comparisons between error unions and error sets

Closes #1302

1 files changed, 21 insertions, 0 deletions

diff --git a/test/behavior/error.zig b/test/behavior/error.zig
index dc29c9bc5b..ba5bdfdc20 100644
--- a/test/behavior/error.zig
+++ b/test/behavior/error.zig
@@ -809,3 +809,24 @@ test "alignment of wrapping an error union payload" {
     };
     try expect((S.foo() catch unreachable).x == 1234);
 }
+
+test "compare error union and error set" {
+    if (builtin.zig_backend == .stage1) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
+
+    var a: anyerror = error.Foo;
+    var b: anyerror!u32 = error.Bar;
+
+    try expect(a != b);
+    try expect(b != a);
+
+    b = error.Foo;
+
+    try expect(a == b);
+    try expect(b == a);
+
+    b = 2;
+
+    try expect(a != b);
+    try expect(b != a);
+}