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/crypto/ec-utils/Cargo.toml

@@ -28,7 +28,6 @@ ark-ed-on-bls12-377-ext = { version = "0.4.1", default-features = false, optiona
 ark-ed-on-bls12-377 = { version = "0.4.0", default-features = false, optional = true }
 ark-scale = { version = "0.0.12", default-features = false, features = ["hazmat"], optional = true }
 sp-runtime-interface = { path = "../../runtime-interface", default-features = false, optional = true }
-sp-std = { path = "../../std", default-features = false, optional = true }
 
 [features]
 default = ["std"]
@@ -47,9 +46,8 @@ std = [
 	"ark-ed-on-bls12-381-bandersnatch?/std",
 	"ark-scale?/std",
 	"sp-runtime-interface?/std",
-	"sp-std?/std",
 ]
-common = ["ark-ec", "ark-scale", "sp-runtime-interface", "sp-std"]
+common = ["ark-ec", "ark-scale", "sp-runtime-interface"]
 bls12-377 = ["ark-bls12-377", "ark-bls12-377-ext", "common"]
 bls12-381 = ["ark-bls12-381", "ark-bls12-381-ext", "common"]
 bw6-761 = ["ark-bw6-761", "ark-bw6-761-ext", "common"]

substrate/primitives/crypto/ec-utils/src/bls12_377.rs

@@ -18,10 +18,10 @@
 //! *BLS12-377* types and host functions.
 
 use crate::utils;
+use alloc::vec::Vec;
 use ark_bls12_377_ext::CurveHooks;
 use ark_ec::{pairing::Pairing, CurveConfig};
 use sp_runtime_interface::runtime_interface;
-use sp_std::vec::Vec;
 
 /// First pairing group definitions.
 pub mod g1 {

substrate/primitives/crypto/ec-utils/src/bls12_381.rs

@@ -18,10 +18,10 @@
 //! *BLS12-381* types and host functions.
 
 use crate::utils;
+use alloc::vec::Vec;
 use ark_bls12_381_ext::CurveHooks;
 use ark_ec::{pairing::Pairing, CurveConfig};
 use sp_runtime_interface::runtime_interface;
-use sp_std::vec::Vec;
 
 /// First pairing group definitions.
 pub mod g1 {

substrate/primitives/crypto/ec-utils/src/bw6_761.rs

@@ -18,10 +18,10 @@
 //! *BW6-761* types and host functions.
 
 use crate::utils;
+use alloc::vec::Vec;
 use ark_bw6_761_ext::CurveHooks;
 use ark_ec::{pairing::Pairing, CurveConfig};
 use sp_runtime_interface::runtime_interface;
-use sp_std::vec::Vec;
 
 /// First pairing group definitions.
 pub mod g1 {

substrate/primitives/crypto/ec-utils/src/ed_on_bls12_377.rs

@@ -18,10 +18,10 @@
 //! *Ed-on-BLS12-377* types and host functions.
 
 use crate::utils;
+use alloc::vec::Vec;
 use ark_ec::CurveConfig;
 use ark_ed_on_bls12_377_ext::CurveHooks;
 use sp_runtime_interface::runtime_interface;
-use sp_std::vec::Vec;
 
 /// Curve hooks jumping into [`host_calls`] host functions.
 #[derive(Copy, Clone)]

substrate/primitives/crypto/ec-utils/src/ed_on_bls12_381_bandersnatch.rs

@@ -19,10 +19,10 @@
 //! computationally expensive operations.
 
 use crate::utils;
+use alloc::vec::Vec;
 use ark_ec::CurveConfig;
 use ark_ed_on_bls12_381_bandersnatch_ext::CurveHooks;
 use sp_runtime_interface::runtime_interface;
-use sp_std::vec::Vec;
 
 /// Curve hooks jumping into [`host_calls`] host functions.
 #[derive(Copy, Clone)]

substrate/primitives/crypto/ec-utils/src/lib.rs

@@ -32,6 +32,8 @@
 #![warn(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
 
+extern crate alloc;
+
 #[cfg(feature = "bls12-377")]
 pub mod bls12_377;
 #[cfg(feature = "bls12-381")]

substrate/primitives/crypto/ec-utils/src/utils.rs

@@ -21,6 +21,7 @@
 // curve may be excluded by the build we resort to `#[allow(unused)]` to
 // suppress the expected warning.
 
+use alloc::vec::Vec;
 use ark_ec::{
 	pairing::{MillerLoopOutput, Pairing},
 	short_weierstrass::{Affine as SWAffine, Projective as SWProjective, SWCurveConfig},
@@ -31,7 +32,6 @@ use ark_scale::{
 	ark_serialize::{CanonicalDeserialize, CanonicalSerialize, Compress, Validate},
 	scale::{Decode, Encode},
 };
-use sp_std::vec::Vec;
 
 // SCALE encoding parameters shared by all the enabled modules
 const SCALE_USAGE: u8 = ark_scale::make_usage(Compress::No, Validate::No);