diff --git a/src/librustc_mir/lib.rs b/src/librustc_mir/lib.rs
index d60b453e0d843..05c843096d27d 100644
--- a/src/librustc_mir/lib.rs
+++ b/src/librustc_mir/lib.rs
@@ -25,7 +25,6 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(const_fn)]
 #![feature(core_intrinsics)]
 #![feature(decl_macro)]
-#![feature(in_band_lifetimes)]
 #![feature(macro_vis_matcher)]
 #![feature(exhaustive_patterns)]
 #![feature(range_contains)]
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 228a1b9b0cdba..cc8af789f47dd 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -13,7 +13,6 @@
        html_root_url = "https://doc.rust-lang.org/nightly/",
        html_playground_url = "https://play.rust-lang.org/")]
 
-#![feature(ascii_ctype)]
 #![feature(rustc_private)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 444bbe15e1111..2f18719b9eb0d 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -243,7 +243,6 @@
 #![feature(align_offset)]
 #![feature(arbitrary_self_types)]
 #![feature(array_error_internals)]
-#![feature(ascii_ctype)]
 #![feature(asm)]
 #![feature(attr_literals)]
 #![feature(box_syntax)]