add proper smallvec support

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "insert_many"
-version = "0.1.0"
+version = "0.1.1"
 authors = ["Robert Habermeier <[email protected]>"]
 description = "insert_many optimization for vec-like structures"
 license = "MIT"
@@ -10,4 +10,4 @@ repository = "https://github.com/rphmeier/insert_many.git"
 smallvec = { version = "0.2.0", optional = true }
 
 [features]
-default = ["smallvec"]
+default = ["smallvec"]

src/lib.rs

@@ -2,12 +2,14 @@
 //! Like `Vec::insert`, but inserts a series of items at an index rather than a single one.
 //! This can lead to significant speedup where multiple items need to be inserted.
 
-#[cfg(features = "smallvec")]
+#[cfg(feature = "smallvec")]
 extern crate smallvec;
 
 use std::iter::ExactSizeIterator;
 use std::ptr;
 
+use smallvec::SmallVec;
+
 /// Generalized trait for inserting many items at once.
 pub trait InsertMany<T> {
     /// Insert all the items in the given iterable at `index`, shifting all elements after it to the right.
@@ -52,7 +54,7 @@ impl<T> InsertMany<T> for Vec<T> {
     }
 }
 
-#[cfg(features = "smallvec")]
+#[cfg(feature = "smallvec")]
 impl<A: smallvec::Array> InsertMany<A::Item> for SmallVec<A> {
     fn insert_many<I>(&mut self, index: usize, iterable: I) where I: IntoIterator<Item=A::Item>, I::IntoIter: ExactSizeIterator {
         impl_veclike!(self, index, iterable);
@@ -80,4 +82,4 @@ mod tests {
 
         assert_eq!(v, vec![1, 2, 3, 4, 5, 6, 7, 8, 9]);
     }
-}
+}