You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/tarpaulin/src/errors
    
    the code of the file until where you have to start completion: use crate::report::cobertura;
use std::fmt::{self, Display, Formatter};

/// Error states that could be returned from tarpaulin
#[derive(Debug)]
pub enum RunError {
    /// Error in cargo manifests
    Manifest(String),
    /// Cargo failed to run
    Cargo(String),
    /// Error trying to resolve package configuration in manifest
    Packages(String),
    /// Failure when attempting to launch test
    TestLaunch(String),
    /// Tests failed to compile
    TestCompile(String),
    /// Test failed during run
    TestRuntime(String),
    TestFailed,
    /// Failed to parse
    Parse(std::io::Error),
    /// Failed to get test coverage
    TestCoverage(String),
    Trace(String),
    CovReport(String),
    OutFormat(String),
    IO(std::io::Error),
    StateMachine(String),
    #[cfg(ptrace_supported)]
    NixError(nix::Error),
    
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        match self {
            Self::Manifest(e) => write!(f, "Failed to parse Cargo.toml! Error: {e}"),
            Self::Cargo(e) => write!(f, "Cargo failed to run! Error: {e}"),
            Self::Packages(e) => write!(f, "Failed to resolve package in manifest! Error: {e}"),
            Self::TestLaunch(e) => write!(f, "Failed to launch test: {e}"),
            Self::TestCompile(e) => write!(f, "Failed to compile tests!\n{e}"),
            Self::TestRuntime(e) => write!(f, "Failed to run tests: {e}"),
            Self::TestFailed => write!(f, "Test failed during run"),
            Self::Parse(e) => write!(f, "Error while parsing: {e}"),
            Self::TestCoverage(e) => write!(f, "Failed to get test coverage! Error: {e}"),
            // TODO: Better error message!
            Self::Trace(e) => write!(f, "Failed to trace! Error: {e}"),
            Self::CovReport(e) => write!(f, "Failed to report coverage! Error: {e}"),
            Self::OutFormat(e) => write!(f, "{e}"),
            Self::IO(e) => write!(f, "{e}"),
            Self::StateMachine(e) => write!(f, "Error running test: {e}"),
            #[cfg(ptrace_supported)]
            Self::NixError(e) => write!(f, "{e}"),
            Self::Html(e) => write!(f, "Failed to generate HTML report! Error: {e}"),
            Self::XML(e) => write!(f, "Failed to generate XML report! Error: {e}"),
            Self::Lcov(e) => write!(f, "Failed to generate Lcov report! Error: {e}"),
            Self::Json(e) => write!(f, "Failed to generate JSON report! Error: {e}"),
            Self::Internal => write!(f, "Tarpaulin experienced an internal error"),
            Self::BelowThreshold(a, e) => {
                write!(
                    f,
                    "Coverage is below the failure threshold {a:.2}% < {e:.2}%"
                )
            }
            Self::Engine(s) => write!(f, "Engine error: {s}"),
        }
    }