Support no-std

[kayabaNerve]

core::error::Error was stabilized in 1.81, which just released.

I'd comment on the existing issue yet noted https://github.com/dtolnay/thiserror/issues/196#issuecomment-1636066787.

[SyntheticBird45]

I support the addition of this feature. thiserror is a blessed crate I would appreciate using in my #![no_std] projects

[Systemcluster]

There is an open pull request: #304

[robamu]

I also strongly support this and would also very much appreciate this in my no_std crates :+1:

[mchodzikiewicz]

having this would be a huge deal for entire embedded community