diff --git a/kernel/lib.rs b/kernel/lib.rs
index d71af53..da193a0 100644
--- a/kernel/lib.rs
+++ b/kernel/lib.rs
@@ -73,7 +73,6 @@
 #![feature(drop_types_in_const)]
 #![feature(heap_api)]
 #![feature(integer_atomics)]
-#![feature(question_mark)]
 #![feature(never_type)]
 #![feature(thread_local)]
 #![no_std]
diff --git a/libstd b/libstd
index 89b6a73..dccb2ab 160000
--- a/libstd
+++ b/libstd
@@ -1 +1 @@
-Subproject commit 89b6a739be426e6ff6e401f6495e7022a90f4d42
+Subproject commit dccb2ab0edfa87653786fc865dc4fcbb9bce863b