diff --git a/src/librustc_infer/lib.rs b/src/librustc_infer/lib.rs
index d6619e5f7f83..31ce04581647 100644
--- a/src/librustc_infer/lib.rs
+++ b/src/librustc_infer/lib.rs
@@ -14,37 +14,14 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![feature(arbitrary_self_types)]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
-#![feature(const_fn)]
-#![feature(const_transmute)]
-#![feature(core_intrinsics)]
 #![feature(drain_filter)]
-#![cfg_attr(windows, feature(libc))]
 #![feature(never_type)]
-#![feature(exhaustive_patterns)]
-#![feature(overlapping_marker_traits)]
-#![feature(extern_types)]
-#![feature(nll)]
-#![feature(optin_builtin_traits)]
-#![feature(option_expect_none)]
 #![feature(range_is_empty)]
-#![feature(specialization)]
-#![feature(unboxed_closures)]
-#![feature(thread_local)]
-#![feature(trace_macros)]
-#![feature(trusted_len)]
-#![feature(stmt_expr_attributes)]
-#![feature(integer_atomics)]
-#![feature(test)]
 #![feature(in_band_lifetimes)]
 #![feature(crate_visibility_modifier)]
-#![feature(log_syntax)]
-#![feature(associated_type_bounds)]
-#![feature(rustc_attrs)]
-#![feature(hash_raw_entry)]
 #![recursion_limit = "512"]
 
 #[macro_use]