Add 12 num::NonZero* types for each primitive integer

RFC: https://github.com/rust-lang/rfcs/pull/2307

src/libstd/lib.rs

@@ -282,6 +282,7 @@
 #![feature(macro_vis_matcher)]
 #![feature(needs_panic_runtime)]
 #![feature(exhaustive_patterns)]
+#![feature(nonzero)]
 #![feature(num_bits_bytes)]
 #![feature(old_wrapping)]
 #![feature(on_unimplemented)]

src/libstd/num.rs

@@ -21,6 +21,17 @@ pub use core::num::{FpCategory, ParseIntError, ParseFloatError, TryFromIntError}
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::num::Wrapping;
 
+#[unstable(feature = "nonzero", issue = "27730")]
+pub use core::num::{
+    NonZeroU8, NonZeroI8, NonZeroU16, NonZeroI16, NonZeroU32, NonZeroI32,
+    NonZeroU64, NonZeroI64, NonZeroUsize, NonZeroIsize,
+};
+
+// Change this to `#[unstable(feature = "i128", issue = "35118")]`
+// if other NonZero* integer types are stabilizied before 128-bit integers
+#[unstable(feature = "nonzero", issue = "27730")]
+pub use core::num::{NonZeroU128, NonZeroI128};
+
 #[cfg(test)] use fmt;
 #[cfg(test)] use ops::{Add, Sub, Mul, Div, Rem};