Implement std::error::source codebase wide

Audit ever error type we have and implement `source` for each.
This commit is contained in:
Tobin C. Harding 2022-05-04 15:56:24 +10:00
parent 0a9191b429
commit 97a5bb1439
22 changed files with 276 additions and 87 deletions

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@ -355,7 +355,16 @@ impl fmt::Display for Bip34Error {
} }
#[cfg(feature = "std")] #[cfg(feature = "std")]
impl ::std::error::Error for Bip34Error {} #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl std::error::Error for Bip34Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::Bip34Error::*;
match self {
Unsupported | NotPresent | UnexpectedPush(_) => None,
}
}
}
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {

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@ -188,7 +188,20 @@ impl fmt::Display for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for Error {} impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::Error::*;
match self {
NonMinimalPush
| EarlyEndOfScript
| NumericOverflow
| BitcoinConsensus(_) // TODO: This should return `Some` but bitcoinconsensus::Error does not implement Error.
| UnknownSpentOutput(_)
| SerializationError => None,
}
}
}
// Our internal error proves that we only return these two cases from `read_uint_iter`. // Our internal error proves that we only return these two cases from `read_uint_iter`.
// Since it's private we don't bother with trait impls besides From. // Since it's private we don't bother with trait impls besides From.

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@ -27,7 +27,6 @@ use crate::prelude::*;
use crate::io; use crate::io;
use core::{fmt, str, default::Default}; use core::{fmt, str, default::Default};
#[cfg(feature = "std")] use std::error;
use crate::hashes::{self, Hash, sha256d}; use crate::hashes::{self, Hash, sha256d};
use crate::hashes::hex::FromHex; use crate::hashes::hex::FromHex;
@ -142,12 +141,14 @@ impl fmt::Display for ParseOutPointError {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl error::Error for ParseOutPointError { impl std::error::Error for ParseOutPointError {
fn cause(&self) -> Option<&dyn error::Error> { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match *self { use self::ParseOutPointError::*;
ParseOutPointError::Txid(ref e) => Some(e),
ParseOutPointError::Vout(ref e) => Some(e), match self {
_ => None, Txid(e) => Some(e),
Vout(e) => Some(e),
Format | TooLong | VoutNotCanonical => None,
} }
} }
} }
@ -733,7 +734,11 @@ impl fmt::Display for NonStandardSighashType {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl error::Error for NonStandardSighashType {} impl std::error::Error for NonStandardSighashType {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
None
}
}
/// Legacy Hashtype of an input's signature /// Legacy Hashtype of an input's signature
#[deprecated(since = "0.28.0", note = "Please use [`EcdsaSighashType`] instead")] #[deprecated(since = "0.28.0", note = "Please use [`EcdsaSighashType`] instead")]
@ -886,9 +891,13 @@ impl fmt::Display for SighashTypeParseError {
} }
} }
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
#[cfg(feature = "std")] #[cfg(feature = "std")]
impl ::std::error::Error for SighashTypeParseError {} #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl std::error::Error for SighashTypeParseError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
None
}
}
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {

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@ -30,7 +30,6 @@
use crate::prelude::*; use crate::prelude::*;
use core::{fmt, mem, u32, convert::From}; use core::{fmt, mem, u32, convert::From};
#[cfg(feature = "std")] use std::error;
use crate::hashes::{sha256d, Hash, sha256}; use crate::hashes::{sha256d, Hash, sha256};
use crate::hash_types::{BlockHash, FilterHash, TxMerkleNode, FilterHeader}; use crate::hash_types::{BlockHash, FilterHash, TxMerkleNode, FilterHeader};
@ -106,18 +105,20 @@ impl fmt::Display for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for Error { impl std::error::Error for Error {
fn cause(&self) -> Option<&dyn error::Error> { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match *self { use self::Error::*;
Error::Io(ref e) => Some(e),
Error::Psbt(ref e) => Some(e), match self {
Error::UnexpectedNetworkMagic { .. } Io(e) => Some(e),
| Error::OversizedVectorAllocation { .. } Psbt(e) => Some(e),
| Error::InvalidChecksum { .. } UnexpectedNetworkMagic { .. }
| Error::NonMinimalVarInt | OversizedVectorAllocation { .. }
| Error::UnknownNetworkMagic(..) | InvalidChecksum { .. }
| Error::ParseFailed(..) | NonMinimalVarInt
| Error::UnsupportedSegwitFlag(..) => None, | UnknownNetworkMagic(_)
| ParseFailed(_)
| UnsupportedSegwitFlag(_) => None,
} }
} }
} }

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@ -111,9 +111,13 @@ impl fmt::Display for CommandStringError {
} }
} }
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
#[cfg(feature = "std")] #[cfg(feature = "std")]
impl ::std::error::Error for CommandStringError {} #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl std::error::Error for CommandStringError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
None
}
}
/// A Network message /// A Network message
#[derive(Clone, Debug, PartialEq, Eq)] #[derive(Clone, Debug, PartialEq, Eq)]

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@ -20,7 +20,6 @@
use crate::io; use crate::io;
use core::fmt; use core::fmt;
#[cfg(feature = "std")] use std::error;
pub mod constants; pub mod constants;
@ -79,11 +78,13 @@ impl From<io::Error> for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl error::Error for Error { impl std::error::Error for Error {
fn cause(&self) -> Option<&dyn error::Error> { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match *self { use self::Error::*;
Error::Io(ref e) => Some(e),
Error::SocketMutexPoisoned | Error::SocketNotConnectedToPeer => None, match self {
Io(e) => Some(e),
SocketMutexPoisoned | SocketNotConnectedToPeer => None,
} }
} }
} }

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@ -37,7 +37,6 @@ use crate::prelude::*;
use core::fmt; use core::fmt;
use core::num::ParseIntError; use core::num::ParseIntError;
use core::str::FromStr; use core::str::FromStr;
#[cfg(feature = "std")] use std::error;
use secp256k1::{Secp256k1, Verification, XOnlyPublicKey}; use secp256k1::{Secp256k1, Verification, XOnlyPublicKey};
use bech32; use bech32;
@ -104,13 +103,22 @@ impl fmt::Display for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for Error { impl std::error::Error for Error {
fn cause(&self) -> Option<&dyn error::Error> { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match *self { use self::Error::*;
Error::Base58(ref e) => Some(e),
Error::Bech32(ref e) => Some(e), match self {
Error::UnparsableWitnessVersion(ref e) => Some(e), Base58(e) => Some(e),
_ => None, Bech32(e) => Some(e),
UnparsableWitnessVersion(e) => Some(e),
EmptyBech32Payload
| InvalidBech32Variant { .. }
| InvalidWitnessVersion(_)
| MalformedWitnessVersion
| InvalidWitnessProgramLength(_)
| InvalidSegwitV0ProgramLength(_)
| UncompressedPubkey
| ExcessiveScriptSize => None,
} }
} }
} }

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@ -192,7 +192,7 @@ impl fmt::Display for ParseAmountError {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for ParseAmountError {} impl std::error::Error for ParseAmountError {}
fn is_too_precise(s: &str, precision: usize) -> bool { fn is_too_precise(s: &str, precision: usize) -> bool {
s.contains('.') || precision >= s.len() || s.chars().rev().take(precision).any(|d| d != '0') s.contains('.') || precision >= s.len() || s.chars().rev().take(precision).any(|d| d != '0')

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@ -68,7 +68,22 @@ impl fmt::Display for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for Error {} impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::Error::*;
match self {
BadByte(_)
| BadChecksum(_, _)
| InvalidLength(_)
| InvalidExtendedKeyVersion(_)
| InvalidAddressVersion(_)
| TooShort(_) => None,
Secp256k1(e) => Some(e),
Hex(e) => Some(e),
}
}
}
/// Vector-like object that holds the first 100 elements on the stack. If more space is needed it /// Vector-like object that holds the first 100 elements on the stack. If more space is needed it
/// will be allocated on the heap. /// will be allocated on the heap.

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@ -85,7 +85,17 @@ impl Display for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for Error {} impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::Error::*;
match self {
UtxoMissing(_) => None,
Io(e) => Some(e),
}
}
}
impl From<io::Error> for Error { impl From<io::Error> for Error {
fn from(io: io::Error) -> Self { fn from(io: io::Error) -> Self {

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@ -22,7 +22,6 @@ use crate::prelude::*;
use crate::io::Write; use crate::io::Write;
use core::{fmt, str::FromStr, default::Default}; use core::{fmt, str::FromStr, default::Default};
use core::ops::Index; use core::ops::Index;
#[cfg(feature = "std")] use std::error;
#[cfg(feature = "serde")] use serde; #[cfg(feature = "serde")] use serde;
use crate::hash_types::XpubIdentifier; use crate::hash_types::XpubIdentifier;
@ -497,12 +496,20 @@ impl fmt::Display for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl error::Error for Error { impl std::error::Error for Error {
fn cause(&self) -> Option<&dyn error::Error> { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
if let Error::Secp256k1(ref e) = *self { use self::Error::*;
Some(e)
} else { match self {
None Secp256k1(e) => Some(e),
Base58(e) => Some(e),
Hex(e) => Some(e),
CannotDeriveFromHardenedKey
| InvalidChildNumber(_)
| InvalidChildNumberFormat
| InvalidDerivationPathFormat
| UnknownVersion(_)
| WrongExtendedKeyLength(_) => None,
} }
} }
} }

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@ -116,7 +116,17 @@ impl fmt::Display for EcdsaSigError {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for EcdsaSigError {} impl std::error::Error for EcdsaSigError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::EcdsaSigError::*;
match self {
HexEncoding(e) => Some(e),
Secp256k1(e) => Some(e),
NonStandardSighashType(_) | EmptySignature => None,
}
}
}
impl From<secp256k1::Error> for EcdsaSigError { impl From<secp256k1::Error> for EcdsaSigError {
fn from(e: secp256k1::Error) -> EcdsaSigError { fn from(e: secp256k1::Error) -> EcdsaSigError {

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@ -16,16 +16,14 @@
//! This module provides keys used in Bitcoin that can be roundtrip //! This module provides keys used in Bitcoin that can be roundtrip
//! (de)serialized. //! (de)serialized.
pub use secp256k1::{XOnlyPublicKey, KeyPair};
use crate::prelude::*; use crate::prelude::*;
use core::{ops, str::FromStr}; use core::{ops, str::FromStr};
use core::fmt::{self, Write}; use core::fmt::{self, Write};
use crate::io;
#[cfg(feature = "std")] use std::error;
use secp256k1::{self, Secp256k1}; pub use secp256k1::{self, Secp256k1, XOnlyPublicKey, KeyPair};
use crate::io;
use crate::network::constants::Network; use crate::network::constants::Network;
use crate::hashes::{Hash, hash160, hex, hex::FromHex}; use crate::hashes::{Hash, hash160, hex, hex::FromHex};
use crate::hash_types::{PubkeyHash, WPubkeyHash}; use crate::hash_types::{PubkeyHash, WPubkeyHash};
@ -57,13 +55,15 @@ impl fmt::Display for Error {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for Error { impl std::error::Error for Error {
fn cause(&self) -> Option<&dyn error::Error> { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match *self { use self::Error::*;
Error::Base58(ref e) => Some(e),
Error::Secp256k1(ref e) => Some(e), match self {
Error::InvalidKeyPrefix(_) => None, Base58(e) => Some(e),
Error::Hex(ref e) => Some(e) Secp256k1(e) => Some(e),
InvalidKeyPrefix(_) => None,
Hex(e) => Some(e),
} }
} }
} }

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@ -37,7 +37,6 @@ mod message_signing {
#[cfg(feature = "base64")] use crate::prelude::*; #[cfg(feature = "base64")] use crate::prelude::*;
use core::fmt; use core::fmt;
#[cfg(feature = "std")] use std::error;
use crate::hashes::sha256d; use crate::hashes::sha256d;
use secp256k1; use secp256k1;
@ -73,11 +72,13 @@ mod message_signing {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl error::Error for MessageSignatureError { impl std::error::Error for MessageSignatureError {
fn cause(&self) -> Option<&dyn error::Error> { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match *self { use self::MessageSignatureError::*;
MessageSignatureError::InvalidEncoding(ref e) => Some(e),
_ => None, match self {
InvalidEncoding(e) => Some(e),
InvalidLength | InvalidBase64 | UnsupportedAddressType(_) => None,
} }
} }
} }

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@ -39,7 +39,6 @@ pub(crate) mod endian;
use crate::prelude::*; use crate::prelude::*;
use crate::io; use crate::io;
use core::fmt; use core::fmt;
#[cfg(feature = "std")] use std::error;
use crate::network; use crate::network;
use crate::consensus::encode; use crate::consensus::encode;
@ -91,12 +90,16 @@ impl fmt::Display for Error {
} }
#[cfg(feature = "std")] #[cfg(feature = "std")]
impl ::std::error::Error for Error { #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn cause(&self) -> Option<&dyn error::Error> { impl std::error::Error for Error {
match *self { fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
Error::Encode(ref e) => Some(e), use self::Error::*;
Error::Network(ref e) => Some(e),
Error::BlockBadProofOfWork | Error::BlockBadTarget => None match self {
Encode(e) => Some(e),
Network(e) => Some(e),
BlockBadProofOfWork
| BlockBadTarget => None
} }
} }
} }

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@ -115,7 +115,32 @@ impl fmt::Display for Error {
} }
#[cfg(feature = "std")] #[cfg(feature = "std")]
impl ::std::error::Error for Error {} #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::Error::*;
match self {
HashParseError(e) => Some(e),
| InvalidMagic
| MissingUtxo
| InvalidSeparator
| PsbtUtxoOutOfbounds
| InvalidKey(_)
| InvalidProprietaryKey
| DuplicateKey(_)
| UnsignedTxHasScriptSigs
| UnsignedTxHasScriptWitnesses
| MustHaveUnsignedTx
| NoMorePairs
| UnexpectedUnsignedTx { .. }
| NonStandardSighashType(_)
| InvalidPreimageHashPair{ .. }
| CombineInconsistentKeySources(_)
| ConsensusEncoding => None,
}
}
}
#[doc(hidden)] #[doc(hidden)]
impl From<hashes::Error> for Error { impl From<hashes::Error> for Error {

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@ -110,7 +110,15 @@ impl core::fmt::Display for IncompleteTapTree {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for IncompleteTapTree {} impl std::error::Error for IncompleteTapTree {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::IncompleteTapTree::*;
match self {
NotFinalized(_) | HiddenParts(_) => None,
}
}
}
/// Taproot Tree representing a finalized [`TaprootBuilder`] (a complete binary tree). /// Taproot Tree representing a finalized [`TaprootBuilder`] (a complete binary tree).
#[derive(Clone, Debug)] #[derive(Clone, Debug)]

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@ -243,7 +243,16 @@ mod display_from_str {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for PsbtParseError {} impl std::error::Error for PsbtParseError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::PsbtParseError::*;
match self {
PsbtEncoding(e) => Some(e),
Base64Encoding(e) => Some(e),
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "base64")))] #[cfg_attr(docsrs, doc(cfg(feature = "base64")))]
impl Display for PartiallySignedTransaction { impl Display for PartiallySignedTransaction {

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@ -286,7 +286,16 @@ impl fmt::Display for SchnorrSigError {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for SchnorrSigError {} impl std::error::Error for SchnorrSigError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::SchnorrSigError::*;
match self {
Secp256k1(e) => Some(e),
InvalidSighashType(_) | InvalidSchnorrSigSize(_) => None,
}
}
}
impl From<secp256k1::Error> for SchnorrSigError { impl From<secp256k1::Error> for SchnorrSigError {

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@ -223,7 +223,23 @@ impl fmt::Display for Error {
} }
#[cfg(feature = "std")] #[cfg(feature = "std")]
impl ::std::error::Error for Error {} #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::Error::*;
match self {
Io(_)
| IndexOutOfInputsBounds { .. }
| SingleWithoutCorrespondingOutput { .. }
| PrevoutsSize
| PrevoutIndex
| PrevoutKind
| WrongAnnex
| InvalidSighashType(_) => None,
}
}
}
impl<'u, T> Prevouts<'u, T> where T: Borrow<TxOut> { impl<'u, T> Prevouts<'u, T> where T: Borrow<TxOut> {
fn check_all(&self, tx: &Transaction) -> Result<(), Error> { fn check_all(&self, tx: &Transaction) -> Result<(), Error> {

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@ -22,8 +22,6 @@ use secp256k1::{self, Secp256k1};
use core::fmt; use core::fmt;
use core::cmp::Reverse; use core::cmp::Reverse;
#[cfg(feature = "std")]
use std::error;
use crate::hashes::{sha256, sha256t, Hash, HashEngine}; use crate::hashes::{sha256, sha256t, Hash, HashEngine};
use crate::schnorr::{TweakedPublicKey, UntweakedPublicKey, TapTweak}; use crate::schnorr::{TweakedPublicKey, UntweakedPublicKey, TapTweak};
@ -1039,7 +1037,20 @@ impl fmt::Display for TaprootBuilderError {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl error::Error for TaprootBuilderError {} impl std::error::Error for TaprootBuilderError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::TaprootBuilderError::*;
match self {
InvalidInternalKey(e) => Some(e),
InvalidMerkleTreeDepth(_)
| NodeNotInDfsOrder
| OverCompleteTree
| IncompleteTree
| EmptyTree => None
}
}
}
/// Detailed error type for taproot utilities. /// Detailed error type for taproot utilities.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
@ -1093,7 +1104,23 @@ impl fmt::Display for TaprootError {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl error::Error for TaprootError {} impl std::error::Error for TaprootError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use self::TaprootError::*;
match self {
InvalidInternalKey(e) => Some(e),
InvalidMerkleBranchSize(_)
| InvalidMerkleTreeDepth(_)
| InvalidTaprootLeafVersion(_)
| InvalidControlBlockSize(_)
| InvalidParity(_)
| EmptyTree => None,
}
}
}
#[cfg(test)] #[cfg(test)]
mod test { mod test {
use crate::{Address, Network}; use crate::{Address, Network};

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@ -528,7 +528,11 @@ impl ::core::fmt::Display for ParseLengthError {
#[cfg(feature = "std")] #[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))] #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
impl ::std::error::Error for ParseLengthError {} impl std::error::Error for ParseLengthError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
None
}
}
impl Uint256 { impl Uint256 {
/// Decay to a uint128 /// Decay to a uint128