this post was submitted on 22 Jun 2023
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Rust

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clap::_derive::_tutorial - Rust (docs.rs)
submitted 1 year ago by kirsten to c/rust
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I've tried to run the example under "Configuring the Parser" and get some errors. What could be my problem?

Errors

  • error: cannot find derive macro Parser in this scope
  • error: cannot find attribute command in this scope
  • error: cannot find attribute arg in this scope
  • error[E0599]: no function or associated item named parse found for struct Cli in the current scope

Cargo.toml

[package]
name = "hello_cargo"
version = "0.1.0"
edition = "2021"

[dependencies]
clap = "4.3.5"
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[โ€“] [email protected] 4 points 1 year ago (1 children)

The tutorial makes a reference to this

This requires enabling the derive feature flag.

But if you aren't as familiar with feature flags, this isn't as helpful.

More specifically on the front page we have

$ cargo add clap --features derive

Maybe we should push that down into the tutorial...

[โ€“] kirsten 1 points 1 year ago

That's the point. I didn't know about the feature flags feature of Rust/Cargo. Of course, if you know it, you "have to" skip it in each tutorial. IMHO, it should be okay ๐Ÿ™‚ Thank you for your answer.