diff --git a/src/lib.rs b/src/lib.rs
index 7a8274119..2e9b8fb06 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,4 @@
 #![feature(generators)]
-#![feature(specialization)]
 #![feature(proc_macro_hygiene)]
 
 #[macro_use]
diff --git a/src/object/types.rs b/src/object/types.rs
index 913c43358..8dca43d87 100644
--- a/src/object/types.rs
+++ b/src/object/types.rs
@@ -5,16 +5,6 @@ pub trait ExtractType: Sized {
     fn extract(value: &Tagged<Value>) -> Result<Self, ShellError>;
 }
 
-impl<T> ExtractType for T {
-    default fn extract(_value: &Tagged<Value>) -> Result<T, ShellError> {
-        let name = std::any::type_name::<T>();
-        Err(ShellError::unimplemented(format!(
-            "<T> ExtractType for {}",
-            name
-        )))
-    }
-}
-
 impl<T: ExtractType> ExtractType for Tagged<T> {
     fn extract(value: &Tagged<Value>) -> Result<Tagged<T>, ShellError> {
         let name = std::any::type_name::<T>();