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在向您的运行时添加模块之后，我正在尝试为Dothereum Runtime实现Parity Substrate paint-evm特征。

根据我之前的工作：How to implement the EVM Trait for a Substrate Runtime?

我为 Dothereum 运行时实现了 EVM Trait：

// Implement the EVM Trait for the Dothereum Runtime.
impl evm::Trait for Runtime {
    type FeeCalculator = FixedGasPrice;
    type ConvertAccountId = TruncatedAccountId;
    type Currency = Balances;
    type Event = Event;
    type Precompiles = ();
}

但是，该paint_evm::Event特征未实现Event：

error: failed to run custom build command for `dothereum-runtime v0.2.2 (/home/user/.opt/dothereum/runtime)`

Caused by:
  process didn't exit successfully: `/home/user/.opt/dothereum/target/debug/build/dothereum-runtime-54902422e823ba8e/build-script-build` (exit code: 1)
--- stdout
Executing build command: "rustup" "run" "nightly" "cargo" "build" "--target=wasm32-unknown-unknown" "--manifest-path=/home/user/.opt/dothereum/target/debug/wbuild/dothereum-runtime/Cargo.toml"

--- stderr
    Blocking waiting for file lock on package cache
   Compiling wasm-build-runner-impl v1.0.0 (/home/user/.opt/dothereum/target/debug/wbuild-runner/dothereum-runtime)
    Finished dev [unoptimized + debuginfo] target(s) in 1.62s
     Running `/home/user/.opt/dothereum/target/debug/wbuild-runner/dothereum-runtime/target/debug/wasm-build-runner-impl`
   Compiling dothereum-runtime v0.2.2 (/home/user/.opt/dothereum/runtime)
error[E0277]: the trait bound `Event: core::convert::From<paint_evm::Event>` is not satisfied
   --> /home/user/.opt/dothereum/runtime/src/lib.rs:255:2
    |
251 | impl evm::Trait for Runtime {
    | --------------------------- in this `impl` item
...
255 |     type Event = Event;
    |     ^^^^^^^^^^^^^^^^^^^ the trait `core::convert::From<paint_evm::Event>` is not implemented for `Event`
    |
    = help: the following implementations were found:
              <Event as core::convert::From<paint_balances::RawEvent<substrate_primitives::crypto::AccountId32, u128, paint_balances::DefaultInstance>>>
              <Event as core::convert::From<paint_grandpa::Event>>
              <Event as core::convert::From<paint_indices::RawEvent<substrate_primitives::crypto::AccountId32, u32>>>
              <Event as core::convert::From<paint_sudo::RawEvent<substrate_primitives::crypto::AccountId32>>>
              <Event as core::convert::From<paint_system::Event>>

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: could not compile `dothereum-runtime`.

To learn more, run the command again with --verbose.

paint_evm模块在这里期望什么。这怎么能代替呢？

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1 回答 1

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这里的错误具有误导性。这里真正的问题是您没有将 EVM 模块放入construct_runtime!宏中。

您需要将此行添加到您的construct_runtime!定义中：

EVM: evm::{Module, Call, Storage, Config, Event},

为了更详细地解释，construct_runtime!宏将为core::convert::From<YOUR_MODULE::Event>每个YOUR_MODULEs 实现特征。因为您没有将模块包含在宏中，所以它不会生成特征实现，并且您会收到您在此处看到的错误。

这就是为什么您会看到错误消息向您建议所有其他实现了此特征的模块，仅仅是因为它们已包含在您的construct_runtime!.

添加此行后，您将克服此处显示的错误，并找到与配置的其他部分相关的任何实际错误。

于 2019-11-22T00:06:28.803 回答