twelf 0.15.0

Twelf is a configuration solution for Rust including 12-Factor support. It is designed with layers in order to configure different sources and formats to build your configuration. The main goal is to be very simple using a proc macro.
Documentation 
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#[cfg(all(
    any(
        feature = "json",
        feature = "yaml",
        feature = "toml",
        feature = "ini",
        feature = "dhall"
    ),
    feature = "shellexpand"
))]
use std::env::VarError;

use thiserror::Error as ErrorTrait;

/// Error generated when instantiate configuration
#[derive(Debug, ErrorTrait)]
pub enum Error {
    #[cfg(all(
        any(
            feature = "json",
            feature = "yaml",
            feature = "toml",
            feature = "ini",
            feature = "dhall"
        ),
        feature = "shellexpand"
    ))]
    #[error("env lookup error")]
    ShellExpand(#[from] shellexpand::LookupError<VarError>),
    #[error("io error")]
    Io(#[from] std::io::Error),
    #[cfg(any(feature = "env", feature = "clap"))]
    #[error("envy serde error")]
    Envy(#[from] envy::Error),
    #[error("json serde error")]
    Json(#[from] serde_json::Error),
    #[cfg(feature = "toml")]
    #[error("toml serde error")]
    Toml(#[from] toml_rs::de::Error),
    #[cfg(feature = "yaml")]
    #[error("yaml serde error")]
    Yaml(#[from] serde_yaml::Error),
    #[cfg(feature = "ini")]
    #[error("ini serde error")]
    Ini(#[from] serde_ini::de::Error),
    #[cfg(feature = "dhall")]
    #[error("dhall serde error")]
    Dhall(#[from] serde_dhall::Error),
    #[error("invalid format")]
    InvalidFormat,
    #[error("deserialize error: {0}")]
    Deserialize(String),
}