I'm not aware of such cases. And The Rust Reference says [1]: > If the value is Err(e), then it will return Err(From::from(e)) from the enclosing function or c

I'm not aware of such cases. And The Rust Reference says [1]: > If the value is Err(e), then it will return Err(From::from(e)) from the enclosing function or closure. Without a specific example, I can't help you further. [1]: https://doc.rust-lang.org/stable/reference/expressions/operator-expr.html#r-expr.try.effects-err https://doc.rust-lang.org/stable/reference/expressions/opera...