Bootstrapping preparation for the library

Since just `ops::Try` will need to change meaning.

library/core/src/iter/range.rs

@@ -1,7 +1,7 @@
 use crate::char;
 use crate::convert::TryFrom;
 use crate::mem;
-use crate::ops::{self, Try};
+use crate::ops::{self, TryWhereOutputEquals};
 
 use super::{FusedIterator, TrustedLen, TrustedRandomAccess};
 
@@ -755,7 +755,7 @@ impl<A: Step> Iterator for ops::RangeInclusive<A> {
     where
         Self: Sized,
         F: FnMut(B, Self::Item) -> R,
-        R: Try<Ok = B>,
+        R: TryWhereOutputEquals<B>,
     {
         if self.is_empty() {
             return try { init };
@@ -860,7 +860,7 @@ impl<A: Step> DoubleEndedIterator for ops::RangeInclusive<A> {
     where
         Self: Sized,
         F: FnMut(B, Self::Item) -> R,
-        R: Try<Ok = B>,
+        R: TryWhereOutputEquals<B>,
     {
         if self.is_empty() {
             return try { init };