derive(Error) for no_std environments

This is a fork of thiserror using the nightly only, experimental error_in_core feature in no_std environments.

Usage

// Cargo.toml
[dependencies]
thiserror = { version = "1.0", package = "thiserror-core", default-features = false }

// main.rs / lib.rs
#![no_std]
#![feature(error_in_core)]

Differences between thiserror and thiserror-core

Differences are kept to a minimum and changes in thiserror master will be adopted by rebasing thiserror-core.

With the default std feature enabled, any functional difference between thiserror and thiserror-core is considered a bug.

As soon as the matching PR is merged or equivalent changes are adopted, this crate will be updated to re-export thiserror.