typeck: Remove old diagnostic that refers to `do`.

src/librustc/middle/typeck/check/mod.rs

@@ -2087,18 +2087,6 @@ pub fn check_expr_with_unifier(fcx: @FnCtxt,
         };
         check_expr(fcx, rhs);
 
-        // If the or operator is used it might be that the user forgot to
-        // supply the do keyword.  Let's be more helpful in that situation.
-        if op == ast::BiOr {
-            match ty::get(lhs_resolved_t).sty {
-                ty::ty_bare_fn(_) | ty::ty_closure(_) => {
-                    tcx.sess.span_note(
-                        ex.span, "did you forget the `do` keyword for the call?");
-                }
-                _ => ()
-            }
-        }
-
         ty::mk_err()
     }
 

src/test/compile-fail/missing-do.rs

@@ -1,19 +0,0 @@
-// Copyright 2012 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.
-
-// Regression test for issue #2783
-
-fn foo(f: ||) { f() }
-
-fn main() {
-    ~"" || 42; //~ ERROR binary operation `||` cannot be applied to type
-    foo || {}; //~ ERROR binary operation `||` cannot be applied to type
-    //~^ NOTE did you forget the `do` keyword for the call?
-}