diff --git a/mod_path/build.rs b/mod_path/build.rs
index c24949d..ad1d40e 100644
--- a/mod_path/build.rs
+++ b/mod_path/build.rs
@@ -1,5 +1,3 @@
-#![feature(convert)]
-
 use std::env;
 use std::fs::File;
 use std::io::Write;
diff --git a/triable/Cargo.toml b/triable/Cargo.toml
index 863778f..8ae4072 100644
--- a/triable/Cargo.toml
+++ b/triable/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "triable"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["Simon Sapin <simon.sapin@exyr.org>"]
 license = "MIT"
 repository = "https://github.com/SimonSapin/rust-std-candidates"
diff --git a/triable/lib.rs b/triable/lib.rs
index cd14a2c..e968d2f 100644
--- a/triable/lib.rs
+++ b/triable/lib.rs
@@ -1,4 +1,4 @@
-use std::error::FromError;
+use std::convert::From;
 
 
 #[macro_export]
@@ -24,11 +24,11 @@ pub trait Triable<Expr, Return> {
 
 
 impl<T1, T2, Err1, Err2> Triable<T1, Result<T2, Err2>> for Result<T1, Err1>
-where Err2: FromError<Err1> {
+where Err2: From<Err1> {
     fn try(self) -> TriableResult<T1, Result<T2, Err2>> {
         match self {
             Ok(value) => TriableResult::Expression(value),
-            Err(error) => TriableResult::EarlyReturn(Err(FromError::from_error(error)))
+            Err(error) => TriableResult::EarlyReturn(Err(From::from(error)))
         }
     }
 }
diff --git a/zip_longest/Cargo.toml b/zip_longest/Cargo.toml
index 43031c6..8354c04 100644
--- a/zip_longest/Cargo.toml
+++ b/zip_longest/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "zip-longest"
-version = "0.1.6"
+version = "0.1.7"
 authors = ["Simon Sapin <simon.sapin@exyr.org>"]
 license = "MIT"
 repository = "https://github.com/SimonSapin/rust-std-candidates"
diff --git a/zip_longest/lib.rs b/zip_longest/lib.rs
index 51f220d..3791ef8 100644
--- a/zip_longest/lib.rs
+++ b/zip_longest/lib.rs
@@ -1,4 +1,5 @@
 #![feature(core)]
+#![cfg_attr(test, feature(step_by))]
 
 use std::cmp;
 use std::iter::RandomAccessIterator;
@@ -126,9 +127,8 @@ pub enum EitherOrBoth<A, B> {
 #[test]
 fn test_iterator_size_hint() {
     use std::usize;
-    use std::iter::count;
 
-    let c = count(0i32, 1);
+    let c = (0i32..).step_by(1);
     let v: &[_] = &[0i32, 1, 2, 3, 4, 5, 6, 7, 8, 9];
     let v2 = &[10i32, 11, 12];
     let vi = v.iter();