Request textDocument/hover failed.

[keplerHaloxx]

rust-analyzer version: ust-analyzer version: 0.3.2379-standalone (8365cf8 2025-04-13)

rustc version: rustc 1.86.0 (05f9846f8 2025-03-31)

editor or extension: VSCode (rust-analyzer version 0.3.2379)

---

problem: When hovering over default_value_t, I receive an error message saying Request textDocument/hover failed. Here is the output of the error. errmsg.txt

dependencies:

[dependencies]
clap = {version="4.5.36", features = ["derive"]}
tokio = { version = "1", features = ["full"] }

code snippet to reproduce:

use clap::{Parser, ValueEnum};

/// Supported audio formats for yt-dlp
#[derive(Copy, Clone, Debug, ValueEnum)]
pub enum AudioFormat {
    Mp3,
    Wav,
    M4a,
    Flac,
    Aac,
    Ogg,
    Opus,
}

#[derive(Parser, Debug)]
#[command(
    name = "Playlist Downloader",
    about = "Easily download playlists from YouTube or Musi"
)]
pub struct Cli {
    /// Set the audio format (e.g., mp3, m4a, flac, wav)
    #[arg(long = "audio-format", value_enum, default_value_t = AudioFormat::Mp3, help = "Convert audio to the given format")]
    pub audio_format: AudioFormat,
}

[ChayimFriedman2]

Minimized:

struct AudioFormat;

trait ValueEnum {
    fn to_possible_value(&self);
}

impl ValueEnum for AudioFormat {
    fn to_possible_value<'a>(&'a self) {}
}

fn main() {
    ValueEnum::to_possible_value(&AudioFormat);
}

The explicit lifetime on the method confuses GenericSubstitution, it puts it instead of the Self parameter.

A simple fix will be to only put type and const arguments in GenericSubstitution, at least until we implement lifetimes properly.