Update lazy_static crate to 1.4.0

This change updates the lazy_static crate version to 1.4.0.

Import subrepo lazy-static/:lazy-static at 421669662b35fcb455f2902daed2e20bbbba79b6

2 files changed, 16 insertions, 21 deletions

diff --git a/lazy-static/src/inline_lazy.rs b/lazy-static/src/inline_lazy.rs
index 268dd45..219ce9c 100644
--- a/lazy-static/src/inline_lazy.rs
+++ b/lazy-static/src/inline_lazy.rs
@@ -10,13 +10,16 @@ extern crate std;
 
 use self::std::prelude::v1::*;
 use self::std::cell::Cell;
+use self::std::hint::unreachable_unchecked;
 use self::std::sync::Once;
+#[allow(deprecated)]
 pub use self::std::sync::ONCE_INIT;
 
-// FIXME: Replace Option<T> with MaybeInitialized<T>
+// FIXME: Replace Option<T> with MaybeUninit<T> (stable since 1.36.0)
 pub struct Lazy<T: Sync>(Cell<Option<T>>, Once);
 
 impl<T: Sync> Lazy<T> {
+    #[allow(deprecated)]
     pub const INIT: Self = Lazy(Cell::new(None), ONCE_INIT);
 
     #[inline(always)]
@@ -29,7 +32,7 @@ impl<T: Sync> Lazy<T> {
         });
 
         // `self.0` is guaranteed to be `Some` by this point
-        // The `Once` will catch and propegate panics
+        // The `Once` will catch and propagate panics
         unsafe {
             match *self.0.as_ptr() {
                 Some(ref x) => x,
@@ -52,14 +55,3 @@ macro_rules! __lazy_static_create {
         static $NAME: $crate::lazy::Lazy<$T> = $crate::lazy::Lazy::INIT;
     };
 }
-
-/// Polyfill for std::hint::unreachable_unchecked. There currently exists a
-/// [crate](https://docs.rs/unreachable) for an equivalent to std::hint::unreachable_unchecked, but
-/// lazy_static currently doesn't include any runtime dependencies and we've chosen to include this
-/// short polyfill rather than include a new crate in every consumer's build.
-///
-/// This should be replaced by std's version when lazy_static starts to require at least Rust 1.27.
-unsafe fn unreachable_unchecked() -> ! {
-    enum Void {}
-    match std::mem::uninitialized::<Void>() {}
-}
diff --git a/lazy-static/src/lib.rs b/lazy-static/src/lib.rs
index 42dc405..cada0dc 100644
--- a/lazy-static/src/lib.rs
+++ b/lazy-static/src/lib.rs
@@ -90,17 +90,13 @@ The `Deref` implementation uses a hidden static variable that is guarded by an a
 
 # Cargo features
 
-This crate provides two cargo features:
+This crate provides one cargo feature:
 
-- `nightly`: This uses unstable language features only available on the nightly release channel for a more optimal implementation. In practice this currently means avoiding a heap allocation per static. This feature might get deprecated at a later point once all relevant optimizations are usable from stable.
-- `spin_no_std` (implies `nightly`): This allows using this crate in a no-std environment, by depending on the standalone `spin` crate.
-
-Both features depend on unstable language features, which means
-no guarantees can be made about them in regard to SemVer stability.
+- `spin_no_std`: This allows using this crate in a no-std environment, by depending on the standalone `spin` crate.
 
 */
 
-#![doc(html_root_url = "https://docs.rs/lazy_static/1.2.0")]
+#![doc(html_root_url = "https://docs.rs/lazy_static/1.4.0")]
 #![no_std]
 
 #[cfg(not(feature = "spin_no_std"))]
@@ -108,6 +104,13 @@ no guarantees can be made about them in regard to SemVer stability.
 #[doc(hidden)]
 pub mod lazy;
 
+#[cfg(test)]
+#[macro_use]
+extern crate doc_comment;
+
+#[cfg(test)]
+doctest!("../README.md");
+
 #[cfg(feature = "spin_no_std")]
 #[path="core_lazy.rs"]
 #[doc(hidden)]
@@ -196,7 +199,7 @@ pub trait LazyStatic {
 /// extern crate lazy_static;
 ///
 /// lazy_static! {
-///     static ref BUFFER: Vec<u8> = (0..65537).collect();
+///     static ref BUFFER: Vec<u8> = (0..255).collect();
 /// }
 ///
 /// fn main() {