Merge pull request #106 from cuviper/nth_back

Specialize `nth_back` (MSRV 1.37)

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         rust:
-          - 1.36.0  # MSRV
+          - 1.37.0  # MSRV
           - stable
           - beta
           - nightly
@@ -38,7 +38,7 @@ jobs:
           toolchain: ${{ matrix.rust }}
 
       - name: MSRV dependencies
-        if: matrix.rust == '1.36.0'
+        if: matrix.rust == '1.37.0'
         run: |
           cargo generate-lockfile
           cargo update -p serde_json --precise 1.0.99

Cargo.toml

@@ -1,9 +1,9 @@
 [package]
 name = "either"
-version = "1.11.0"
+version = "1.12.0"
 authors = ["bluss"]
 edition = "2018"
-rust-version = "1.36"
+rust-version = "1.37"
 
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rayon-rs/either"

README.rst

@@ -25,12 +25,18 @@ __ https://docs.rs/either/
 How to use with cargo::
 
     [dependencies]
-    either = "1.11"
+    either = "1.12"
 
 
 Recent Changes
 --------------
 
+- 1.12.0
+
+  - **MSRV**: ``either`` now requires Rust 1.37 or later.
+
+  - Specialize ``nth_back`` for ``Either`` and ``IterEither``, by @cuviper (#106)
+
 - 1.11.0
 
   - Add new trait ``IntoEither`` that is useful to convert to ``Either`` in method chains,

src/iterator.rs

@@ -141,10 +141,9 @@ where
         for_both!(*self, ref mut inner => inner.next_back())
     }
 
-    // TODO(MSRV): This was stabilized in Rust 1.37
-    // fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
-    //     for_both!(*self, ref mut inner => inner.nth_back(n))
-    // }
+    fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
+        for_both!(*self, ref mut inner => inner.nth_back(n))
+    }
 
     fn rfold<Acc, G>(self, init: Acc, f: G) -> Acc
     where
@@ -279,10 +278,9 @@ where
         Some(map_either!(self.inner, ref mut inner => inner.next_back()?))
     }
 
-    // TODO(MSRV): This was stabilized in Rust 1.37
-    // fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
-    //     Some(map_either!(self.inner, ref mut inner => inner.nth_back(n)?))
-    // }
+    fn nth_back(&mut self, n: usize) -> Option<Self::Item> {
+        Some(map_either!(self.inner, ref mut inner => inner.nth_back(n)?))
+    }
 
     fn rfold<Acc, G>(self, init: Acc, f: G) -> Acc
     where