Commit 03b1fbe50d

@@ -3618,8 +3618,9 @@ fn airIsErr(
     const operand = try f.resolveInst(un_op);
     const operand_ty = f.air.typeOf(un_op);
     const local = try f.allocLocal(Type.initTag(.bool), .Const);
-    const payload_ty = operand_ty.errorUnionPayload();
-    const error_ty = operand_ty.errorUnionSet();
+    const err_union_ty = if (is_ptr) operand_ty.childType() else operand_ty;
+    const payload_ty = err_union_ty.errorUnionPayload();
+    const error_ty = err_union_ty.errorUnionSet();
 
     try writer.writeAll(" = ");
 

@@ -5693,7 +5693,8 @@ pub const FuncGen = struct {
 
         const un_op = self.air.instructions.items(.data)[inst].un_op;
         const operand = try self.resolveInst(un_op);
-        const err_union_ty = self.air.typeOf(un_op);
+        const operand_ty = self.air.typeOf(un_op);
+        const err_union_ty = if (operand_is_ptr) operand_ty.childType() else operand_ty;
         const payload_ty = err_union_ty.errorUnionPayload();
         const err_set_ty = try self.dg.lowerType(Type.initTag(.anyerror));
         const zero = err_set_ty.constNull();

@@ -724,3 +724,15 @@ test "simple else prong allowed even when all errors handled" {
     };
     try expect(value == 255);
 }
+
+test {
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+
+    var err_union: anyerror!u8 = 15;
+
+    const payload_ptr = &(err_union catch unreachable);
+    try expect(payload_ptr.* == 15);
+}