Revert "chore: bump MSRV to 1.81 & use core::error::Error in place …

…of `std` (#780)"

This reverts commit 7b84276.

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
         rust: [
             "stable",
             "nightly",
-            "1.81", # MSRV
+            "1.79", # MSRV
           ]
         flags: [
             # No features
@@ -35,10 +35,10 @@ jobs:
         include:
           # MSRV features
           - os: "ubuntu-latest"
-            rust: "1.81" # MSRV
+            rust: "1.79" # MSRV
             flags: "--features json"
           - os: "windows-latest"
-            rust: "1.81" # MSRV
+            rust: "1.79" # MSRV
             flags: "--features json"
           # All features
           - os: "ubuntu-latest"
@@ -57,10 +57,10 @@ jobs:
           cache-on-failure: true
       # Only run tests on latest stable and above
       - name: build
-        if: ${{ matrix.rust == '1.81' }} # MSRV
+        if: ${{ matrix.rust == '1.79' }} # MSRV
         run: cargo build --workspace ${{ matrix.flags }}
       - name: test
-        if: ${{ matrix.rust != '1.81' }} # MSRV
+        if: ${{ matrix.rust != '1.79' }} # MSRV
         run: cargo test --workspace ${{ matrix.flags }}
 
   miri:

Cargo.toml

@@ -5,7 +5,7 @@ resolver = "2"
 [workspace.package]
 version = "0.8.9"
 edition = "2021"
-rust-version = "1.81"
+rust-version = "1.79"
 authors = ["Alloy Contributors"]
 license = "MIT OR Apache-2.0"
 homepage = "https://github.com/alloy-rs/core"

README.md

@@ -56,7 +56,7 @@ When updating this, also update:
 - .github/workflows/ci.yml
 -->
 
-The current MSRV (minimum supported rust version) is 1.81.
+The current MSRV (minimum supported rust version) is 1.79.
 
 Alloy will keep a rolling MSRV policy of **at least** two versions behind the
 latest stable release (so if the latest stable release is 1.58, we would

clippy.toml

@@ -1 +1 @@
-msrv = "1.81"
+msrv = "1.79"

crates/dyn-abi/src/coerce.rs

@@ -256,7 +256,8 @@ enum Error {
     EmptyHexStringWithoutPrefix,
 }
 
-impl core::error::Error for Error {}
+#[cfg(feature = "std")]
+impl std::error::Error for Error {}
 
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

crates/primitives/src/postgres.rs

@@ -63,7 +63,7 @@ pub enum ToSqlError {
     Overflow(usize, Type),
 }
 
-impl core::error::Error for ToSqlError {}
+impl std::error::Error for ToSqlError {}
 
 /// Convert to Postgres types.
 ///
@@ -225,7 +225,7 @@ pub enum FromSqlError {
     ParseError(Type),
 }
 
-impl core::error::Error for FromSqlError {}
+impl std::error::Error for FromSqlError {}
 
 impl<'a, const BITS: usize, const LIMBS: usize> FromSql<'a> for Signed<BITS, LIMBS> {
     fn accepts(ty: &Type) -> bool {

crates/primitives/src/signed/errors.rs

@@ -48,7 +48,8 @@ impl fmt::Display for ParseSignedError {
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub struct BigIntConversionError;
 
-impl core::error::Error for BigIntConversionError {}
+#[cfg(feature = "std")]
+impl std::error::Error for BigIntConversionError {}
 
 impl fmt::Display for BigIntConversionError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

crates/sol-type-parser/src/error.rs

@@ -8,7 +8,8 @@ pub type Result<T, E = Error> = core::result::Result<T, E>;
 #[derive(Clone, PartialEq, Eq)]
 pub struct Error(Repr);
 
-impl core::error::Error for Error {}
+#[cfg(feature = "std")]
+impl std::error::Error for Error {}
 
 impl fmt::Debug for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

crates/sol-type-parser/src/input.rs

@@ -18,7 +18,8 @@ impl fmt::Display for CustomError {
     }
 }
 
-impl core::error::Error for CustomError {}
+#[cfg(feature = "std")]
+impl std::error::Error for CustomError {}
 
 pub type Input<'a> = winnow::Stateful<&'a str, RecursionCheck>;
 

crates/sol-types/src/types/error.rs

@@ -103,7 +103,8 @@ impl fmt::Display for Revert {
     }
 }
 
-impl core::error::Error for Revert {}
+#[cfg(feature = "std")]
+impl std::error::Error for Revert {}
 
 impl AsRef<str> for Revert {
     #[inline]
@@ -263,7 +264,8 @@ impl fmt::Display for Panic {
     }
 }
 
-impl core::error::Error for Panic {}
+#[cfg(feature = "std")]
+impl std::error::Error for Panic {}
 
 impl SolError for Panic {
     type Parameters<'a> = (crate::sol_data::Uint<256>,);

crates/sol-types/src/types/interface/mod.rs

@@ -2,6 +2,9 @@ use crate::{alloc::string::ToString, Error, Panic, Result, Revert, SolError};
 use alloc::{string::String, vec::Vec};
 use core::{convert::Infallible, fmt, iter::FusedIterator, marker::PhantomData};
 
+#[cfg(feature = "std")]
+use std::error::Error as StdError;
+
 mod event;
 pub use event::SolEventInterface;
 
@@ -208,9 +211,10 @@ impl<T: fmt::Display> fmt::Display for ContractError<T> {
     }
 }
 
-impl<T: core::error::Error + 'static> core::error::Error for ContractError<T> {
+#[cfg(feature = "std")]
+impl<T: StdError + 'static> StdError for ContractError<T> {
     #[inline]
-    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
         match self {
             Self::CustomError(error) => Some(error),
             Self::Panic(panic) => Some(panic),

crates/syn-solidity/tests/contracts.rs

@@ -100,7 +100,7 @@ impl Drop for GitPatcher<'_> {
     }
 }
 
-fn parse_file(path: &Path) -> Result<File, Box<dyn core::error::Error>> {
+fn parse_file(path: &Path) -> Result<File, Box<dyn std::error::Error>> {
     let solidity = fs::read_to_string(path)?;
     syn::parse_str(&solidity).map_err(Into::into)
 }