Rollup merge of #27018 - arielb1:enum-update, r=eddyb

Fixes #26948.

r? @eddyb

src/test/compile-fail/issue-26948.rs

@@ -0,0 +1,16 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    enum Foo { A { x: u32 } }
+    let orig = Foo::A { x: 5 };
+    Foo::A { x: 6, ..orig };
+    //~^ ERROR functional record update syntax requires a struct
+}