<分区>
我正在尝试将新成员变量添加到 impl block 中的结构。
我正在使用 protoc-rust从 Protocol Buffer 程序化地生成 Rust 代码。特别是，它为原型(prototype)中定义的消息生成结构和方法。我需要向这些结构添加新成员以初始化结构中字节对象的一些 WebAssembly::Instance
结构:
pub struct Module {
// message fields
pub module_name: ::std::string::String,
pub init_script: ::std::string::String,
pub JS_boiler_plate: ::std::string::String,
pub functions: ::protobuf::RepeatedField<Function>,
pub meta_data: ::std::string::String,
pub packager: ::std::string::String,
pub pure_wasm: bool,
pub wasm_binary: ::std::vec::Vec<u8>,
// special fields
pub unknown_fields: ::protobuf::UnknownFields,
pub cached_size: ::protobuf::CachedSize,
}
我想做的事情:
impl RPC_Module::Module {
self.wasm_instance: WebAssembly::Instance;
pub fn init(&mut self) -> Result<(), &'static str> {
// Init the instance based off of wasm_binary
let self.wasm_instance = WebAssembly::Instance::new()
}
}
我得到的:
Compiling wRPC v0.1.0 (/Users/swarfield/Code/wRPC-Core/w-rpc-core)
error: expected one of `async`, `const`, `crate`, `default`, `existential`, `extern`, `fn`, `pub`, `type`, `unsafe`, or `}`, found `let`
--> src/protos/mod.rs:12:5
|
11 | impl RPC_Module::Module {
| - expected one of 11 possible tokens here
12 | let self.wasm_instance: WebAssembly::Instance;
| ^^^ unexpected token