auto merge of #17432 : nick29581/rust/contrib, r=brson

[rust.git] / src / doc / rust.md

diff --git a/src/doc/rust.md b/src/doc/rust.md
index 345b7615168f0e98d3d9696bd346694e43ebdeb6..2ffe22cba7553b00660beec8f188860c82fc4e02 100644 (file)
--- a/src/doc/rust.md
+++ b/src/doc/rust.md
@@ -2557,6 +2557,8 @@ The currently implemented features of the reference compiler are:
 
 * `tuple_indexing` - Allows use of tuple indexing (expressions like `expr.0`)
 
+* `associated_types` - Allows type aliases in traits. Experimental.
+
 If a feature is promoted to a language feature, then all existing programs will
 start to receive compilation warnings about #[feature] directives which enabled
 the new feature (because the directive is no longer necessary). However, if
@@ -3831,8 +3833,9 @@ fn map<A: Clone, B: Clone>(f: |A| -> B, xs: &[A]) -> Vec<B> {
        return vec![];
     }
     let first: B = f(xs[0].clone());
-    let rest: Vec<B> = map(f, xs.slice(1, xs.len()));
-    return vec![first].append(rest.as_slice());
+    let mut rest: Vec<B> = map(f, xs.slice(1, xs.len()));
+    rest.insert(0, first);
+    return rest;
 }
 ~~~~