Stabilize FnOnce::Output + Fix rebase

Author: petrochenkov

src/libcore/ops.rs

@@ -1929,7 +1929,7 @@ pub trait FnMut<Args> : FnOnce<Args> {
 #[fundamental] // so that regex can rely that `&str: !FnMut`
 pub trait FnOnce<Args> {
     /// The returned type after the call operator is used.
-    #[unstable(feature = "fn_traits", issue = "29625")]
+    #[stable(feature = "fn_once_output", since = "1.12.0")]
     type Output;
 
     /// This is called when the call operator is used.

src/librustc_resolve/lib.rs

@@ -2287,7 +2287,7 @@ impl<'a> Resolver<'a> {
                                          .and_then(|resolution| {
                         let always_binding = !pat_src.is_refutable() || opt_pat.is_some() ||
                                              bmode != BindingMode::ByValue(Mutability::Immutable);
-                        match def {
+                        match resolution.base_def {
                             Def::Struct(..) | Def::Variant(..) |
                             Def::Const(..) | Def::AssociatedConst(..) if !always_binding => {
                                 // A constant, unit variant, etc pattern.
@@ -2296,12 +2296,11 @@ impl<'a> Resolver<'a> {
                             Def::Struct(..) | Def::Variant(..) |
                             Def::Const(..) | Def::AssociatedConst(..) | Def::Static(..) => {
                                 // A fresh binding that shadows something unacceptable.
-                                let kind_name = PathResolution::new(def).kind_name();
                                 resolve_error(
                                     self,
                                     ident.span,
                                     ResolutionError::BindingShadowsSomethingUnacceptable(
-                                        pat_src.descr(), kind_name, ident.node.name)
+                                        pat_src.descr(), resolution.kind_name(), ident.node.name)
                                 );
                                 None
                             }

src/test/compile-fail/associated-types/cache/project-fn-ret-contravariant.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(fn_traits)]
 #![feature(unboxed_closures)]
 #![feature(rustc_attrs)]
 

src/test/compile-fail/associated-types/cache/project-fn-ret-invariant.rs

@@ -18,7 +18,6 @@
 
 // revisions: ok oneuse transmute krisskross
 
-#![feature(fn_traits)]
 #![allow(dead_code, unused_variables)]
 
 use std::marker::PhantomData;

src/test/run-pass/issue-28550.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(fn_traits)]
-
 struct A<F: FnOnce()->T,T>(F::Output);
 struct B<F: FnOnce()->T,T>(A<F,T>);