Rust 重复依赖项

Question

我正在尝试使用玩具代码示例，我的

Cargo.toml

是：

[package]
name = "reth_mempool"
version = "0.1.0"
edition = "2021"
    
[dependencies]
reth-transaction-pool = { git = "https://github.com/paradigmxyz/reth.git", tag = "v0.2.0-beta.5"}

我在编译 reth-primitives 时遇到很多错误。第一个是：

error[E0308]: mismatched types
   --> /home/ittay/.cargo/git/checkouts/reth-36d3ea1d1152b20c/54f75cd/crates/primitives/src/chain/spec.rs:28:28
    |
28  |           genesis_hash: Some(b256!(
    |  _______________________----_^
    | |                       |
    | |                       arguments to this enum variant are incorrect
29  | |             "d4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3"
30  | |         )),
    | |_________^ expected `alloy_primitives::FixedBytes<32>`, found `revm_primitives::FixedBytes<32>`
    |
    = note: `revm_primitives::FixedBytes<32>` and `alloy_primitives::FixedBytes<32>` have similar names, but are actually distinct types
note: `revm_primitives::FixedBytes<32>` is defined in crate `alloy_primitives`
   --> /home/ittay/.cargo/registry/src/index.crates.io-6f17d22bba15001f/alloy-primitives-0.7.0/src/bits/fixed.rs:33:1
    |
33  | pub struct FixedBytes<const N: usize>(#[into_iterator(owned, ref, ref_mut)] pub [u8; N]);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: `alloy_primitives::FixedBytes<32>` is defined in crate `alloy_primitives`
   --> /home/ittay/.cargo/registry/src/index.crates.io-6f17d22bba15001f/alloy-primitives-0.6.4/src/bits/fixed.rs:33:1
    |
33  | pub struct FixedBytes<const N: usize>(#[into_iterator(owned, ref, ref_mut)] pub [u8; N]);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: perhaps two different versions of crate `alloy_primitives` are being used?
help: the type constructed contains `revm_primitives::FixedBytes<32>` due to the type of the argument passed
   --> /home/ittay/.cargo/git/checkouts/reth-36d3ea1d1152b20c/54f75cd/crates/primitives/src/chain/spec.rs:28:23
    |
28  |            genesis_hash: Some(b256!(
    |  ________________________^____-
    | | _______________________|
    | ||
29  | ||             "d4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3"
30  | ||         )),
    | ||_________-^
    | |__________|
    |            this argument influences the type of `Some`
note: tuple variant defined here
   --> /home/ittay/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:578:5
    |
578 |     Some(#[stable(feature = "rust1", since = "1.0.0")] T),
    |     ^^^^

确实，合金基元出现在 0.6.4 和 0.7.0 中。

如果我签出 reth 存储库（使用相同的标签）并构建，它就可以工作并且

cargo tree

显示它仅使用 0.7.0。

我不知道为什么使用0.6.4。我该如何解决这个问题？

作为奖励，我很乐意解释为什么货物甚至允许在多个版本中使用同一个库（根据

cargo tree

，有时对于同一个板条箱）。看来这几乎总是会导致冲突。

Answer 1

您可能需要使用resolver版本2来解决问题。

自 Rust 1.51.0 起，Cargo 选择支持新的功能解析器，可以使用

resolver = "2"

中的

Cargo.toml

激活。

此外，在

edition = "2021"

中写

Cargo.toml

也会暗示

resolver = "2"

。

您可以在货物手册中查看此部分了解详情。