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I'd love to read more on how you implemented this. I hope I don't sound lazy, but can you point me a starting location to read up on it?

Maybe it's something I can backport to serde.

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Code-wise, it's not too painful [1], the problem is that you need to enable more features for syn. By default, syn doesn't compile in support for parsing arbitrary types / expressions, which does increase the time / space needed.

Since syn is a pretty fundamental crate, I've a feeling that Serde probably doesn't want to turn on this feature for minimal gain, but that's pure speculation on my part.

[1]: https://github.com/shepmaster/snafu/blob/1dbba9514e2abfdff01...

[2]: https://github.com/shepmaster/snafu/blob/1dbba9514e2abfdff01...

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