UI unit test for note when matching tuple enum with struct pattern

src/test/ui/type-check/issue-41314.rs

@@ -0,0 +1,19 @@
+// Copyright 2017 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.
+
+enum X {
+    Y(u32)
+}
+
+fn main() {
+    match X::Y(0) {
+        X::Y { number } => {}
+    }
+}

src/test/ui/type-check/issue-41314.stderr

@@ -0,0 +1,16 @@
+error[E0026]: variant `X::Y` does not have a field named `number`
+  --> $DIR/issue-41314.rs:17:16
+   |
+17 |         X::Y { number } => {}
+   |                ^^^^^^ variant `X::Y` does not have field `number`
+
+error[E0027]: pattern does not mention field `0`
+  --> $DIR/issue-41314.rs:17:9
+   |
+17 |         X::Y { number } => {}
+   |         ^^^^^^^^^^^^^^^ missing field `0`
+   |
+   = note: trying to match a tuple variant with a struct variant pattern
+
+error: aborting due to 2 previous errors
+