Remove redundant TryFrom/TryInto imports.

components/zcash_encoding/src/lib.rs

@@ -10,7 +10,6 @@
 
 use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 use nonempty::NonEmpty;
-use std::convert::TryFrom;
 use std::io::{self, Read, Write};
 use std::iter::FromIterator;
 
@@ -271,7 +270,6 @@ impl Optional {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::convert::{TryFrom, TryInto};
     use std::fmt::Debug;
 
     #[test]

components/zcash_note_encryption/src/lib.rs

@@ -24,8 +24,6 @@ extern crate alloc;
 #[cfg(feature = "alloc")]
 use alloc::vec::Vec;
 
-use core::convert::TryInto;
-
 use chacha20::{
     cipher::{NewCipher, StreamCipher, StreamCipherSeek},
     ChaCha20,

zcash_client_backend/examples/diversify-address.rs

@@ -1,5 +1,3 @@
-use std::convert::TryInto;
-
 use gumdrop::Options;
 use zcash_client_backend::encoding::{decode_extended_full_viewing_key, encode_payment_address};
 use zcash_primitives::{

zcash_client_backend/src/encoding.rs

@@ -7,7 +7,6 @@
 
 use bech32::{self, Error, FromBase32, ToBase32, Variant};
 use bs58::{self, decode::Error as Bs58Error};
-use std::convert::TryInto;
 use std::fmt;
 use std::io::{self, Write};
 use zcash_primitives::{

zcash_client_backend/src/keys.rs

@@ -8,9 +8,6 @@ use zcash_primitives::{
 
 use crate::address::UnifiedAddress;
 
-#[cfg(feature = "transparent-inputs")]
-use std::convert::TryInto;
-
 #[cfg(feature = "transparent-inputs")]
 use zcash_primitives::legacy::keys::{self as legacy, IncomingViewingKey};
 

zcash_client_backend/src/proto.rs

@@ -1,7 +1,6 @@
 //! Generated code for handling light client protobuf structs.
 
 use ff::PrimeField;
-use std::convert::{TryFrom, TryInto};
 
 use zcash_primitives::{
     block::{BlockHash, BlockHeader},

zcash_client_sqlite/src/wallet/transact.rs

@@ -1,7 +1,6 @@
 //! Functions for creating transactions.
 //!
 use rusqlite::{named_params, Row};
-use std::convert::TryInto;
 
 use ff::PrimeField;
 

zcash_extensions/src/transparent/demo.rs

@@ -18,8 +18,6 @@
 //! - `tx_b`: `[ TzeIn(tx_a, preimage_1) -> TzeOut(value, hash_2) ]`
 //! - `tx_c`: `[ TzeIn(tx_b, preimage_2) -> [any output types...] ]`
 
-use std::convert::TryFrom;
-use std::convert::TryInto;
 use std::fmt;
 use std::ops::{Deref, DerefMut};
 

zcash_primitives/src/legacy/keys.rs

@@ -2,7 +2,6 @@ use hdwallet::{ExtendedPrivKey, ExtendedPubKey, KeyIndex};
 use ripemd::Digest as RipemdDigest;
 use secp256k1::PublicKey;
 use sha2::{Digest as Sha2Digest, Sha256};
-use std::convert::TryInto;
 
 use crate::{consensus, keys::prf_expand_vec, zip32::AccountId};
 

zcash_primitives/src/memo.rs

@@ -1,7 +1,6 @@
 //! Structs for handling encrypted memos.
 
 use std::cmp::Ordering;
-use std::convert::{TryFrom, TryInto};
 use std::error;
 use std::fmt;
 use std::ops::Deref;
@@ -275,7 +274,6 @@ impl str::FromStr for Memo {
 
 #[cfg(test)]
 mod tests {
-    use std::convert::TryInto;
     use std::str::FromStr;
 
     use super::{Error, Memo, MemoBytes};

zcash_primitives/src/merkle_tree.rs

@@ -7,7 +7,6 @@ use incrementalmerkletree::{
     Altitude,
 };
 use std::collections::VecDeque;
-use std::convert::TryFrom;
 use std::io::{self, Read, Write};
 use std::iter::repeat;
 use zcash_encoding::{Optional, Vector};
@@ -620,7 +619,6 @@ impl<Node: Hashable> MerklePath<Node> {
 mod tests {
     use incrementalmerkletree::bridgetree::Frontier;
     use proptest::prelude::*;
-    use std::convert::TryInto;
     use std::io::{self, Read, Write};
 
     use crate::sapling::{testing::arb_node, Node};

zcash_primitives/src/merkle_tree/incremental.rs

@@ -1,7 +1,6 @@
 //! Implementations of serialization and parsing for Orchard note commitment trees.
 
 use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
-use std::convert::{TryFrom, TryInto};
 use std::io::{self, Read, Write};
 
 use incrementalmerkletree::{

zcash_primitives/src/sapling.rs

@@ -17,7 +17,6 @@ use incrementalmerkletree::{self, Altitude};
 use lazy_static::lazy_static;
 use rand_core::{CryptoRng, RngCore};
 use std::array::TryFromSliceError;
-use std::convert::{TryFrom, TryInto};
 use std::io::{self, Read, Write};
 use subtle::{Choice, ConstantTimeEq};
 
@@ -526,7 +525,6 @@ impl Note {
 pub mod testing {
     use proptest::prelude::*;
     use std::cmp::min;
-    use std::convert::TryFrom;
 
     use crate::{
         transaction::components::amount::MAX_MONEY, zip32::testing::arb_extended_spending_key,

zcash_primitives/src/sapling/keys.rs

@@ -4,7 +4,6 @@
 //!
 //! [section 4.2.2]: https://zips.z.cash/protocol/protocol.pdf#saplingkeycomponents
 
-use std::convert::TryInto;
 use std::io::{self, Read, Write};
 
 use crate::{

zcash_primitives/src/sapling/note_encryption.rs

@@ -5,7 +5,6 @@ use ff::PrimeField;
 use group::{cofactor::CofactorGroup, GroupEncoding};
 use jubjub::{AffinePoint, ExtendedPoint};
 use rand_core::RngCore;
-use std::convert::TryInto;
 
 use zcash_note_encryption::{
     try_compact_note_decryption, try_note_decryption, try_output_recovery_with_ock,
@@ -474,7 +473,6 @@ mod tests {
     use group::{cofactor::CofactorGroup, GroupEncoding};
     use rand_core::OsRng;
     use rand_core::{CryptoRng, RngCore};
-    use std::convert::TryInto;
 
     use zcash_note_encryption::{
         batch, EphemeralKeyBytes, NoteEncryption, OutgoingCipherKey, ENC_CIPHERTEXT_SIZE,

zcash_primitives/src/transaction/components/sapling.rs

@@ -1,5 +1,4 @@
 use core::fmt::Debug;
-use std::convert::TryInto;
 
 use ff::PrimeField;
 use group::GroupEncoding;
@@ -429,7 +428,6 @@ pub mod testing {
     use proptest::collection::vec;
     use proptest::prelude::*;
     use rand::{rngs::StdRng, SeedableRng};
-    use std::convert::TryFrom;
 
     use crate::{
         constants::{SPENDING_KEY_GENERATOR, VALUE_COMMITMENT_RANDOMNESS_GENERATOR},

zcash_primitives/src/transaction/sighash.rs

@@ -1,6 +1,5 @@
 use crate::legacy::Script;
 use blake2b_simd::Hash as Blake2bHash;
-use std::convert::TryInto;
 
 use super::{
     components::{

zcash_primitives/src/transaction/sighash_v5.rs

@@ -17,9 +17,6 @@ use crate::transaction::{
     Authorization, TransactionData, TransparentDigests, TxDigests,
 };
 
-#[cfg(feature = "zfuture")]
-use std::convert::TryInto;
-
 #[cfg(feature = "zfuture")]
 use zcash_encoding::{CompactSize, Vector};
 

zcash_primitives/src/zip32.rs

@@ -6,7 +6,6 @@ use aes::Aes256;
 use blake2b_simd::Params as Blake2bParams;
 use byteorder::{ByteOrder, LittleEndian, ReadBytesExt, WriteBytesExt};
 use fpe::ff1::{BinaryNumeralString, FF1};
-use std::convert::TryInto;
 use std::ops::AddAssign;
 use subtle::{Choice, ConditionallySelectable};