Rollup merge of #32712 - jonas-schievink:autoderef-fields-for-fn-ty, r=nagisa

Autoderef when suggesting to call `(self.field)`

Fixes #32128

src/test/compile-fail/issue-32128.rs

@@ -0,0 +1,25 @@
+// Copyright 2016 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.
+
+struct Example {
+    example: Box<Fn(i32) -> i32>
+}
+
+fn main() {
+    let demo = Example {
+        example: Box::new(|x| {
+            x + 1
+        })
+    };
+
+    demo.example(1);    //~ ERROR no method named `example`
+                        //~^ NOTE use `(demo.example)(...)`
+    // (demo.example)(1);
+}