Remove useless imports (#11136)

Because `TryInto`/`TryFrom` are in prelude by default from edition 2021

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

substrate/primitives/core/src/crypto.rs

@@ -38,7 +38,7 @@ pub use secrecy::SecretString;
 use sp_runtime_interface::pass_by::PassByInner;
 #[doc(hidden)]
 pub use sp_std::ops::Deref;
-use sp_std::{convert::TryFrom, hash::Hash, str, vec::Vec};
+use sp_std::{hash::Hash, str, vec::Vec};
 /// Trait to zeroize a memory buffer.
 pub use zeroize::Zeroize;
 
@@ -535,7 +535,7 @@ impl From<[u8; 32]> for AccountId32 {
 	}
 }
 
-impl<'a> sp_std::convert::TryFrom<&'a [u8]> for AccountId32 {
+impl<'a> TryFrom<&'a [u8]> for AccountId32 {
 	type Error = ();
 	fn try_from(x: &'a [u8]) -> Result<AccountId32, ()> {
 		if x.len() == 32 {

substrate/primitives/core/src/ecdsa.rs

@@ -137,7 +137,7 @@ impl AsMut<[u8]> for Public {
 	}
 }
 
-impl sp_std::convert::TryFrom<&[u8]> for Public {
+impl TryFrom<&[u8]> for Public {
 	type Error = ();
 
 	fn try_from(data: &[u8]) -> Result<Self, Self::Error> {
@@ -209,7 +209,7 @@ impl<'de> Deserialize<'de> for Public {
 #[derive(Encode, Decode, MaxEncodedLen, PassByInner, TypeInfo, PartialEq, Eq)]
 pub struct Signature(pub [u8; 65]);
 
-impl sp_std::convert::TryFrom<&[u8]> for Signature {
+impl TryFrom<&[u8]> for Signature {
 	type Error = ();
 
 	fn try_from(data: &[u8]) -> Result<Self, Self::Error> {

substrate/primitives/core/src/ed25519.rs

@@ -39,8 +39,6 @@ use crate::crypto::{DeriveJunction, Pair as TraitPair, SecretStringError};
 #[cfg(feature = "std")]
 use bip39::{Language, Mnemonic, MnemonicType};
 #[cfg(feature = "full_crypto")]
-use core::convert::TryFrom;
-#[cfg(feature = "full_crypto")]
 use ed25519_dalek::{Signer as _, Verifier as _};
 #[cfg(feature = "std")]
 use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
@@ -116,7 +114,7 @@ impl Deref for Public {
 	}
 }
 
-impl sp_std::convert::TryFrom<&[u8]> for Public {
+impl TryFrom<&[u8]> for Public {
 	type Error = ();
 
 	fn try_from(data: &[u8]) -> Result<Self, Self::Error> {
@@ -215,7 +213,7 @@ impl<'de> Deserialize<'de> for Public {
 #[derive(Encode, Decode, MaxEncodedLen, PassByInner, TypeInfo, PartialEq, Eq)]
 pub struct Signature(pub [u8; 64]);
 
-impl sp_std::convert::TryFrom<&[u8]> for Signature {
+impl TryFrom<&[u8]> for Signature {
 	type Error = ();
 
 	fn try_from(data: &[u8]) -> Result<Self, Self::Error> {

substrate/primitives/core/src/offchain/mod.rs

@@ -21,10 +21,7 @@ use crate::{OpaquePeerId, RuntimeDebug};
 use codec::{Decode, Encode};
 use scale_info::TypeInfo;
 use sp_runtime_interface::pass_by::{PassByCodec, PassByEnum, PassByInner};
-use sp_std::{
-	convert::TryFrom,
-	prelude::{Box, Vec},
-};
+use sp_std::prelude::{Box, Vec};
 
 pub use crate::crypto::KeyTypeId;
 

substrate/primitives/core/src/sr25519.rs

@@ -35,8 +35,6 @@ use schnorrkel::{
 #[cfg(feature = "full_crypto")]
 use sp_std::vec::Vec;
 #[cfg(feature = "std")]
-use std::convert::TryFrom;
-#[cfg(feature = "std")]
 use substrate_bip39::mini_secret_from_entropy;
 
 use crate::{
@@ -142,7 +140,7 @@ impl std::str::FromStr for Public {
 	}
 }
 
-impl sp_std::convert::TryFrom<&[u8]> for Public {
+impl TryFrom<&[u8]> for Public {
 	type Error = ();
 
 	fn try_from(data: &[u8]) -> Result<Self, Self::Error> {
@@ -215,7 +213,7 @@ impl<'de> Deserialize<'de> for Public {
 #[derive(Encode, Decode, MaxEncodedLen, PassByInner, TypeInfo, PartialEq, Eq)]
 pub struct Signature(pub [u8; 64]);
 
-impl sp_std::convert::TryFrom<&[u8]> for Signature {
+impl TryFrom<&[u8]> for Signature {
 	type Error = ();
 
 	fn try_from(data: &[u8]) -> Result<Self, Self::Error> {