Structs that implement Parser from clap::Parser throw an error no-such-field

[lever1209]

rust-analyzer version: 0.4.1352-standalone

rustc version: rustc 1.66.0 (69f9c33d7 2022-12-12)

relevant settings:

{
	"rust-analyzer.files.excludeDirs": [
		"target"
	],
	"rust-analyzer.cargo.features": ["interactive-cli", "debug"]
}

[dependencies]
clap = { version = "4.0.32", features = ["derive"] }

#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
struct Args {
	#[arg(action = ArgAction::Set, id = "config_path", help = "path to an alternate config file.", short, long)]
	config: String,

	#[cfg(feature = "linux-qt")]
	#[arg(action = ArgAction::SetTrue, long = "qt")]
	use_qt: bool,

	#[cfg(feature = "linux-gtk")]
	#[arg(action = ArgAction::SetTrue, long = "gtk")]
	use_gtk: bool,

	#[cfg(any(
		feature = "linux-gtk",
		feature = "linux-qt",
		feature = "windows-uwp",
		feature = "windows-native"
	))]
	#[arg(action = ArgAction::SetTrue, long = "nogui")]
	nogui: bool,
}

[lnicola]

You haven't said which field is missing. Does config work?

[lever1209]

use_qt, use_gtk, and nogui, anything that is currently disabled because of features

[lnicola]

You'll have to enable those features for the code to be visible.

[lever1209]

im fully aware, just replicate it and see what i mean

[lowr]

Given

#[derive(clap::Parser)]
struct Args {
    #[cfg(feature = "linux-qt")]
	use_qt: bool,
}

we expand the derive macro to

#[deny(clippy::correctness)]
impl clap::FromArgMatches for Args {
    // ...
    fn from_arg_matches_mut(
        __clap_arg_matches: &mut clap::ArgMatches,
    ) -> ::std::result::Result<Self, clap::Error> {
        #![allow(deprecated)]
        let v = Args {
            use_qt: /* ... */
        };
        ::std::result::Result::Ok(v)
    }
    // ...
}

which emits no-such-field. We should cfg out fields but I'm not sure when that should happen (before proc macro invocation or after that?).

[Veykril]

This seems to be #8434 if I am not mistaken (but for attributes, not derives)

[rbtcollins]

Similar case I think?

#[derive(Parser)]
struct Cli {
    #[clap(long, short, value_delimiter = ',', num_args=1..)]
    things: Vec<ThingName>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, ValueEnum)]
enum ThingName {
    #[cfg(feature = "test")]
    SomeThing
}

will error in rust-analyzer unless the feature is enabled

[Veykril]

Fixed in #16789