DioxusLabs/dioxus · error · anyhow::Error

cargo fmt failed with status

Error message

cargo fmt failed with status: {out:?}

What it means

Raised in indentation_for when the `cargo fmt -- --print-config current` subprocess used to discover rustfmt's configured indentation exits with a non-success status. This is an external tool failure: cargo/rustfmt could not produce the config for the given file or directory (broken toolchain, bad config, or cargo errors), so indentation options cannot be derived.

Solutions

1. cargo fmt failed. Fix the syntax errors rustfmt reported in the output.

When it happens

Trigger: Thrown at packages/cli/src/cli/autoformat.rs:212 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@24f6a829df (2026-08-23). Data as JSON: /api/errors/6aa38ae821072709. Report an issue: GitHub.

Appendix: source

Thrown at packages/cli/src/cli/autoformat.rs:212

        bail!("{files_formatted} files needed formatting");
    }

    Ok(())
}

fn indentation_for(
    file_or_dir: impl AsRef<Path>,
    split_line_attributes: bool,
) -> Result<IndentOptions> {
    let out = std::process::Command::new("cargo")
        .args(["fmt", "--", "--print-config", "current"])
        .arg(file_or_dir.as_ref())
        .stdout(std::process::Stdio::piped())
        .stderr(std::process::Stdio::inherit())
        .output()?;

    if !out.status.success() {
        bail!("cargo fmt failed with status: {out:?}");
    }

    let config = String::from_utf8_lossy(&out.stdout);

    let hard_tabs = config
        .lines()
        .find(|line| line.starts_with("hard_tabs "))
        .and_then(|line| line.split_once('='))
        .map(|(_, value)| value.trim() == "true")
        .context("Could not find hard_tabs option in rustfmt config")?;
    let tab_spaces = config
        .lines()
        .find(|line| line.starts_with("tab_spaces "))
        .and_then(|line| line.split_once('='))
        .map(|(_, value)| value.trim().parse::<usize>())
        .context("Could not find tab_spaces option in rustfmt config")?
        .context("Could not parse tab_spaces option in rustfmt config")?;

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