use 关键字: 在一个作用域内,use关键字创建了一个成员的快捷方式,用来减少长路径的重复。在任何可以引用crate::garden::vegetables::Asparagus的作用域,你可以通过 use crate::garden::vegetables::Asparagus;创建一个快捷方式,然后你就可以在作用域中只写Asparagus来使用该类型。 这里我们创建一个名为backyard的二进...
272:24 | 272 | let name = slice::from_raw_parts(info.name.as_ptr() as *const u8, info.name.len()); | ^^^ use of undeclared crate or module `slice` | help: consider importing one of these items | 1 + use alloc::slice; | 1 + use core::slice; | 1 + use crate::slice...
error[E0432]: unresolved import `rand` --> main.rs:1:5 | 1 | use rand::Rng; | ^^^ maybe a missing crate `rand`? error[E0433]: failed to resolve: use of undeclared type or module `rand` --> main.rs:4:19 | 4 | let rnd_num = rand::thread_rng().gen_range(1, 100); ...
error[E0433]: failed to resolve: use of undeclared type `Module` --> crates/wasm-runner/src/lib.rs:6:22 | 6 | let result = Module::from_file("./tests/test.wasm"); | ^^^ use of undeclared type `Module` For more information about this error, try `rustc --explain E0433`. 我...
否则你不应该直接调用rustc。始终使用cargo。如果你想要一个cdylib，在Cargo.toml中这样说：
[...]在二进制箱中对函数进行基准测试是不可能的。二进制crate不能依赖于其他crate，这包括外部测试和...
--crate-type=lib，#![crate_type = "lib"]-将生成Rust库。由于库可以以多种形式显示自身，因此...
If you encounter this error you probably need to use a match or if let to deal with the possibility of failure. Example: let x = Some(1); match x { Some(y) => { // do something }, None => {} } // or: if let Some(y) = x { // do something }RunE0...
Code play pub struct S; impl fmt::Debug for S { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { } } Current output Compiling playground v0.0.1 (/playground) error[E0433]: failed to resolve: use of undeclared crate or module `f...
Use of undeclared type or module `HashMap` [E0433] foo.rs:16 let mut map = HashMap::new(); ^~~~ foo.rs:16:19: 16:31 help: run `rustc --explain E0433` to see a detailed explanation foo.rs:16:19: 16:31 error: unresolved name `HashMap::new` [E0425] foo.rs:16 let mut...