diff --git a/Cargo.toml b/Cargo.toml
index 925aa78..8622f80 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "smallvec"
-version = "0.6.11"
+version = "0.6.12"
 authors = ["Simon Sapin <simon.sapin@exyr.org>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/servo/rust-smallvec"
diff --git a/lib.rs b/lib.rs
index c973eb0..cedf2bd 100644
--- a/lib.rs
+++ b/lib.rs
@@ -1253,12 +1253,7 @@ trait SpecFrom<A: Array, S> {
 }
 
 #[cfg(feature = "specialization")]
-impl<'a, A: Array> SpecFrom<A, &'a [A::Item]> for SmallVec<A> where A::Item: Clone {
-    #[inline]
-    default fn spec_from(slice: &'a [A::Item]) -> SmallVec<A> {
-        slice.into_iter().cloned().collect()
-    }
-}
+mod specialization;
 
 #[cfg(feature = "specialization")]
 impl<'a, A: Array> SpecFrom<A, &'a [A::Item]> for SmallVec<A> where A::Item: Copy {
diff --git a/specialization.rs b/specialization.rs
new file mode 100644
index 0000000..2e7bb1e
--- /dev/null
+++ b/specialization.rs
@@ -0,0 +1,16 @@
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementations that require `default fn`.
+
+use super::{SpecFrom, SmallVec, Array};
+
+impl<'a, A: Array> SpecFrom<A, &'a [A::Item]> for SmallVec<A> where A::Item: Clone {
+    #[inline]
+    default fn spec_from(slice: &'a [A::Item]) -> SmallVec<A> {
+        slice.into_iter().cloned().collect()
+    }
+}