fix fallout

looks like some mix of #18653 and `projection_must_outlive`, but
that needs to be investigated further (crater run?)

Author: Ariel Ben-Yehuda

src/librustc/middle/ty/structural_impls.rs

@@ -417,7 +417,9 @@ impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>> Lift<'tcx> for (A, B) {
 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for [T] {
     type Lifted = Vec<T::Lifted>;
     fn lift_to_tcx(&self, tcx: &ty::ctxt<'tcx>) -> Option<Self::Lifted> {
-        let mut result = Vec::with_capacity(self.len());
+        // type annotation needed to inform `projection_must_outlive`
+        let mut result : Vec<<T as Lift<'tcx>>::Lifted>
+            = Vec::with_capacity(self.len());
         for x in self {
             if let Some(value) = tcx.lift(x) {
                 result.push(value);

src/libstd/thread/mod.rs

@@ -266,7 +266,8 @@ impl Builder {
         let my_thread = Thread::new(name);
         let their_thread = my_thread.clone();
 
-        let my_packet = Arc::new(UnsafeCell::new(None));
+        let my_packet : Arc<UnsafeCell<Option<Result<T>>>>
+            = Arc::new(UnsafeCell::new(None));
         let their_packet = my_packet.clone();
 
         let main = move || {

src/test/compile-fail/issue-18959.rs

@@ -22,6 +22,7 @@ fn foo(b: &Bar) {
     b.foo(&0)
     //~^ ERROR the trait `Foo` is not implemented for the type `Bar`
     //~| ERROR E0038
+    //~| WARNING E0038
 }
 
 fn main() {

src/test/compile-fail/object-safety-issue-22040.rs

@@ -26,6 +26,7 @@ struct SExpr<'x> {
 impl<'x> PartialEq for SExpr<'x> {
     fn eq(&self, other:&SExpr<'x>) -> bool {
         println!("L1: {} L2: {}", self.elements.len(), other.elements.len());
+
         let result = self.elements.len() == other.elements.len();
 
         println!("Got compare {}", result);

src/test/compile-fail/trait-test-2.rs

@@ -21,4 +21,5 @@ fn main() {
     //~^ ERROR E0038
     //~| ERROR E0038
     //~| ERROR E0277
+    //~| WARNING E0038
 }