sp-std removal from substrate/primitives (#3274)

This PR removes sp-std crate from substrate/primitives sub-directories.

For now crates that have `pub use` of sp-std or export macros that would
necessitate users of the macros to `extern crate alloc` have been
excluded from this PR.

There should be no breaking changes in this PR.

---------

Co-authored-by: Koute <koute@users.noreply.github.com>

substrate/primitives/trie/src/error.rs

@@ -15,7 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use sp_std::{boxed::Box, vec::Vec};
+use alloc::{boxed::Box, vec::Vec};
 
 /// Error type used for trie related errors.
 #[derive(Debug, PartialEq, Eq, Clone)]

substrate/primitives/trie/src/lib.rs

@@ -19,6 +19,8 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
+extern crate alloc;
+
 #[cfg(feature = "std")]
 pub mod cache;
 mod error;
@@ -33,6 +35,8 @@ mod trie_stream;
 #[cfg(feature = "std")]
 pub mod proof_size_extension;
 
+use alloc::{borrow::Borrow, boxed::Box, vec, vec::Vec};
+use core::marker::PhantomData;
 /// Our `NodeCodec`-specific error.
 pub use error::Error;
 /// Various re-exports from the `hash-db` crate.
@@ -42,7 +46,6 @@ use hash_db::{Hasher, Prefix};
 pub use memory_db::{prefixed_key, HashKey, KeyFunction, PrefixedKey};
 /// The Substrate format implementation of `NodeCodec`.
 pub use node_codec::NodeCodec;
-use sp_std::{borrow::Borrow, boxed::Box, marker::PhantomData, vec::Vec};
 pub use storage_proof::{CompactProof, StorageProof};
 /// Trie codec reexport, mainly child trie support
 /// for trie compact proof.
@@ -500,7 +503,7 @@ pub struct KeySpacedDBMut<'a, DB: ?Sized, H>(&'a mut DB, &'a [u8], PhantomData<H
 /// Utility function used to merge some byte data (keyspace) and `prefix` data
 /// before calling key value database primitives.
 fn keyspace_as_prefix_alloc(ks: &[u8], prefix: Prefix) -> (Vec<u8>, Option<u8>) {
-	let mut result = sp_std::vec![0; ks.len() + prefix.0.len()];
+	let mut result = vec![0; ks.len() + prefix.0.len()];
 	result[..ks.len()].copy_from_slice(ks);
 	result[ks.len()..].copy_from_slice(prefix.0);
 	(result, prefix.1)

substrate/primitives/trie/src/node_codec.rs

@@ -19,9 +19,10 @@
 
 use super::node_header::{NodeHeader, NodeKind};
 use crate::{error::Error, trie_constants};
+use alloc::{borrow::Borrow, vec::Vec};
 use codec::{Compact, Decode, Encode, Input};
+use core::{marker::PhantomData, ops::Range};
 use hash_db::Hasher;
-use sp_std::{borrow::Borrow, marker::PhantomData, ops::Range, vec::Vec};
 use trie_db::{
 	nibble_ops,
 	node::{NibbleSlicePlan, NodeHandlePlan, NodePlan, Value, ValuePlan},
@@ -30,7 +31,7 @@ use trie_db::{
 
 /// Helper struct for trie node decoder. This implements `codec::Input` on a byte slice, while
 /// tracking the absolute position. This is similar to `std::io::Cursor` but does not implement
-/// `Read` and `io` is not in `sp-std`.
+/// `Read` and `io` are not in `core` or `alloc`.
 struct ByteSliceInput<'a> {
 	data: &'a [u8],
 	offset: usize,

substrate/primitives/trie/src/storage_proof.rs

@@ -15,14 +15,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use alloc::{collections::btree_set::BTreeSet, vec::Vec};
 use codec::{Decode, Encode};
+use core::iter::{DoubleEndedIterator, IntoIterator};
 use hash_db::{HashDB, Hasher};
 use scale_info::TypeInfo;
-use sp_std::{
-	collections::btree_set::BTreeSet,
-	iter::{DoubleEndedIterator, IntoIterator},
-	vec::Vec,
-};
+
 // Note that `LayoutV1` usage here (proof compaction) is compatible
 // with `LayoutV0`.
 use crate::LayoutV1 as Layout;

substrate/primitives/trie/src/trie_codec.rs

@@ -21,7 +21,7 @@
 //! it to substrate specific layout and child trie system.
 
 use crate::{CompactProof, HashDBT, TrieConfiguration, TrieHash, EMPTY_PREFIX};
-use sp_std::{boxed::Box, vec::Vec};
+use alloc::{boxed::Box, vec::Vec};
 use trie_db::{CError, Trie};
 
 /// Error for trie node decoding.

substrate/primitives/trie/src/trie_stream.rs

@@ -21,9 +21,9 @@ use crate::{
 	node_header::{size_and_prefix_iterator, NodeKind},
 	trie_constants,
 };
+use alloc::vec::Vec;
 use codec::{Compact, Encode};
 use hash_db::Hasher;
-use sp_std::vec::Vec;
 use trie_root;
 
 /// Codec-flavored TrieStream.