Crate evaluation for 2017-06-27: error-chain

One thing I’d really appreciate is if this crate functioned, even in a degraded manner (i.e. no backtraces or std::error support) in no_std contexts, as it seems to becoming the de facto way to write Rust error boilerplate.

I opened an issue here:

https://github.com/brson/error-chain/issues/138

I am still investigating the feasibility.

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