Support From generation for Backtrace in stable rust
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- Rust
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Description
Currently Backtrace support has a (documented) limitation of requiring nightly rust. Presumably, this is to use `provide` API.
We'd like to use `Backtrace` and `#[from]` generation in stable rust, but it currently is tied to unstable `error_generic_member_access`.
`Backtrace` is stable since rust 1.62.0 would be nice to use it without implementing From manually and use provide api only when it is available.
See #387 for more discussion
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