Fix Rust beta compiler errors 1.78.0-beta.1 (#5439)

* remove redundant imports

* fix test

* contains key

* fmt

* Merge branch 'unstable' into fix-beta-compiler

crypto/eth2_keystore/src/json_keystore/checksum_module.rs

@@ -6,7 +6,6 @@
 use super::hex_bytes::HexBytes;
 use serde::{Deserialize, Serialize};
 use serde_json::{Map, Value};
-use std::convert::TryFrom;
 
 /// Used for ensuring that serde only decodes valid checksum functions.
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]

crypto/eth2_keystore/src/json_keystore/cipher_module.rs

@@ -5,7 +5,6 @@
 
 use super::hex_bytes::HexBytes;
 use serde::{Deserialize, Serialize};
-use std::convert::TryFrom;
 
 /// Used for ensuring that serde only decodes valid cipher functions.
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]

crypto/eth2_keystore/src/json_keystore/hex_bytes.rs

@@ -1,5 +1,4 @@
 use serde::{Deserialize, Serialize};
-use std::convert::TryFrom;
 
 /// To allow serde to encode/decode byte arrays from HEX ASCII strings.
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]

crypto/eth2_keystore/src/json_keystore/kdf_module.rs

@@ -8,7 +8,6 @@ use crate::DKLEN;
 use hmac::{Hmac, Mac, NewMac};
 use serde::{Deserialize, Serialize};
 use sha2::Sha256;
-use std::convert::TryFrom;
 
 /// KDF module representation.
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]

crypto/eth2_keystore/src/keystore.rs

@@ -23,7 +23,6 @@ use serde::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
 use std::fs::File;
 use std::io::{Read, Write};
-use std::iter::FromIterator;
 use std::path::Path;
 use std::str;
 use unicode_normalization::UnicodeNormalization;