Add back missing #![feature(never_type)]s

Author: kennytm

src/librustc_mir/lib.rs

@@ -33,6 +33,7 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(nonzero)]
 #![feature(inclusive_range_fields)]
 #![feature(crate_visibility_modifier)]
+#![feature(never_type)]
 #![cfg_attr(stage0, feature(try_trait))]
 
 extern crate arena;

src/librustc_typeck/lib.rs

@@ -82,6 +82,7 @@ This API is completely unstable and subject to change.
 #![feature(slice_patterns)]
 #![feature(slice_sort_by_cached_key)]
 #![feature(dyn_trait)]
+#![feature(never_type)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;

src/libstd/primitive_docs.rs

@@ -79,6 +79,7 @@ mod prim_bool { }
 /// write:
 ///
 /// ```
+/// #![feature(never_type)]
 /// # fn foo() -> u32 {
 /// let x: ! = {
 ///     return 123
@@ -155,6 +156,7 @@ mod prim_bool { }
 /// for example:
 ///
 /// ```
+/// #![feature(never_type)]
 /// # use std::fmt;
 /// # trait Debug {
 /// # fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result;

src/test/run-fail/adjust_never.rs

@@ -11,6 +11,9 @@
 // Test that a variable of type ! can coerce to another type.
 
 // error-pattern:explicit
+
+#![feature(never_type)]
+
 fn main() {
     let x: ! = panic!();
     let y: u32 = x;

src/test/run-fail/call-fn-never-arg.rs

@@ -12,6 +12,7 @@
 
 // error-pattern:wowzers!
 
+#![feature(never_type)]
 #![allow(unreachable_code)]
 
 fn foo(x: !) -> ! {

src/test/run-fail/cast-never.rs

@@ -11,6 +11,9 @@
 // Test that we can explicitly cast ! to another type
 
 // error-pattern:explicit
+
+#![feature(never_type)]
+
 fn main() {
     let x: ! = panic!();
     let y: u32 = x as u32;

src/test/run-fail/never-associated-type.rs

@@ -12,6 +12,8 @@
 
 // error-pattern:kapow!
 
+#![feature(never_type)]
+
 trait Foo {
     type Wow;
 

src/test/run-fail/never-type-arg.rs

@@ -12,6 +12,8 @@
 
 // error-pattern:oh no!
 
+#![feature(never_type)]
+
 struct Wub;
 
 impl PartialEq<!> for Wub {