Remove std feature from cranelift-entity

cranelift/entity/src/boxed_slice.rs

@@ -6,7 +6,7 @@ use crate::EntityRef;
 use core::marker::PhantomData;
 use core::ops::{Index, IndexMut};
 use core::slice;
-use std::boxed::Box;
+use alloc::boxed::Box;
 
 /// A slice mapping `K -> V` allocating dense entity references.
 ///
@@ -141,7 +141,7 @@ where
 mod tests {
     use super::*;
     use crate::primary::PrimaryMap;
-    use std::vec::Vec;
+    use alloc::vec::Vec;
 
     // `EntityRef` impl for testing.
     #[derive(Clone, Copy, Debug, PartialEq, Eq)]

cranelift/entity/src/lib.rs

@@ -31,7 +31,6 @@
 
 #![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
 #![warn(unused_import_braces)]
-#![cfg_attr(feature = "std", deny(unstable_features))]
 #![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
 #![cfg_attr(
     feature = "cargo-clippy",
@@ -52,12 +51,7 @@
 )]
 #![no_std]
 
-#[cfg(not(feature = "std"))]
-#[macro_use]
-extern crate alloc as std;
-#[cfg(feature = "std")]
-#[macro_use]
-extern crate std;
+extern crate alloc;
 
 // Re-export core so that the macros works with both std and no_std crates
 #[doc(hidden)]

cranelift/entity/src/list.rs

@@ -3,7 +3,7 @@ use crate::packed_option::ReservedValue;
 use crate::EntityRef;
 use core::marker::PhantomData;
 use core::mem;
-use std::vec::Vec;
+use alloc::vec::Vec;
 
 /// A small list of entity references allocated from a pool.
 ///

cranelift/entity/src/map.rs

@@ -13,7 +13,7 @@ use serde::{
     ser::{SerializeSeq, Serializer},
     Deserialize, Serialize,
 };
-use std::vec::Vec;
+use alloc::vec::Vec;
 
 /// A mapping `K -> V` for densely indexed entity references.
 ///
@@ -222,7 +222,7 @@ where
     where
         D: Deserializer<'de>,
     {
-        use std::fmt;
+        use alloc::fmt;
         struct SecondaryMapVisitor<K, V> {
             unused: PhantomData<fn(K) -> V>,
         }

cranelift/entity/src/primary.rs

@@ -9,8 +9,8 @@ use core::ops::{Index, IndexMut};
 use core::slice;
 #[cfg(feature = "enable-serde")]
 use serde::{Deserialize, Serialize};
-use std::boxed::Box;
-use std::vec::Vec;
+use alloc::boxed::Box;
+use alloc::vec::Vec;
 
 /// A primary mapping `K -> V` allocating dense entity references.
 ///

cranelift/entity/src/set.rs

@@ -3,7 +3,7 @@
 use crate::keys::Keys;
 use crate::EntityRef;
 use core::marker::PhantomData;
-use std::vec::Vec;
+use alloc::vec::Vec;
 
 /// A set of `K` for densely indexed entity references.
 ///

cranelift/entity/src/sparse.rs

@@ -12,7 +12,7 @@ use crate::EntityRef;
 use core::mem;
 use core::slice;
 use core::u32;
-use std::vec::Vec;
+use alloc::vec::Vec;
 
 /// Trait for extracting keys from values stored in a `SparseMap`.
 ///