macrotest 1.2.0

Test harness for macro expansion
Documentation 
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#[derive(Debug)]
pub(crate) enum Error {
    Cargo(std::io::Error),
    CargoExpandExecution(String),
    CargoFail,
    CargoMetadata(serde_json::error::Error),
    Io(std::io::Error),
    TomlSer(toml::ser::Error),
    TomlDe(toml::de::Error),
    Glob(glob::GlobError),
    GlobPattern(glob::PatternError),
    ManifestDir,
    PkgName,
    UnrecognizedEnv(std::ffi::OsString),
}

pub(crate) type Result<T> = std::result::Result<T, Error>;

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        use self::Error::*;

        match self {
            Cargo(e) => write!(f, "{}", e),
            CargoExpandExecution(e) => write!(f, "Failed to execute cargo command: {}", e),
            CargoFail => write!(f, "cargo reported an error"),
            CargoMetadata(e) => write!(f, "{}", e),
            Io(e) => write!(f, "{}", e),
            TomlSer(e) => write!(f, "{}", e),
            TomlDe(e) => write!(f, "{}", e),
            Glob(e) => write!(f, "{}", e),
            GlobPattern(e) => write!(f, "{}", e),
            ManifestDir => write!(f, "could not find CARGO_MANIFEST_DIR env var"),
            PkgName => write!(f, "could not find CARGO_PKG_NAME env var"),
            UnrecognizedEnv(e) => write!(
                f,
                "unrecognized value of MACROTEST: \"{}\"",
                e.to_string_lossy()
            ),
        }
    }
}

impl From<std::io::Error> for Error {
    fn from(e: std::io::Error) -> Self {
        Error::Io(e)
    }
}

impl From<toml::ser::Error> for Error {
    fn from(e: toml::ser::Error) -> Self {
        Error::TomlSer(e)
    }
}

impl From<toml::de::Error> for Error {
    fn from(e: toml::de::Error) -> Self {
        Error::TomlDe(e)
    }
}

impl From<glob::GlobError> for Error {
    fn from(e: glob::GlobError) -> Self {
        Error::Glob(e)
    }
}

impl From<glob::PatternError> for Error {
    fn from(e: glob::PatternError) -> Self {
        Error::GlobPattern(e)
    }
}