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我正在尝试使用 RustCrypto 来实例化河豚对象。该new方法由block-cipher-trait crate 中的 traitBlockCipherVarKey实现。

这是我的最小示例：

extern crate block_cipher_trait;
use block_cipher_trait::BlockCipherVarKey;

extern crate blowfish;
use blowfish::Blowfish;

fn main() {
    let key = Vec::new();
    Blowfish::new(key)
}

具有以下内容Cargo.toml：

[dependencies]
blowfish = "0.2.1"
block-cipher-trait = "0.3.0"

我尝试构建它，但出现以下错误：

error: no associated item named `new` found for type `blowfish::Blowfish` in the current scope
 --> src/main.rs:9:5
  |
9 |     Blowfish::new(key)
  |     ^^^^^^^^^^^^^
  |
  = note: the method `new` exists but the following trait bounds were not satisfied: `blowfish::Blowfish : block_cipher_trait::BlockCipherFixKey`, `&blowfish::Blowfish : block_cipher_trait::BlockCipherFixKey`, `&mut blowfish::Blowfish : block_cipher_trait::BlockCipherFixKey`
  = help: items from traits can only be used if the trait is in scope; the following trait is implemented but not in scope, perhaps add a `use` for it:
  = help: candidate #1: `use block_cipher_trait::BlockCipherVarKey;`

为什么use block_cipher_trait::BlockCipherVarKey不考虑在线2？为什么编译器建议我添加它，尽管它已经在这里了？

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