Stop breaking type coercion

[elichai]

The current way we match over the result breaks type coercion, example:

example this will break: (https://play.rust-lang.org/?gist=487d56225ce4b06116eb357f75bf6474)

#[logfn(INFO)]
fn first() -> Result<u8, Box<dyn Error>> {
    Err(Box::new(MyError))
}

Possible solutions:

• Use match instead of map/map_err (this complicates no-std support, see #7)
• Use the ? operator, (ie Ok(expr?)), but this again complicates no-std support because Ok is a prelude that might not always be in scope

[Quba1]

If the possible solution is merged might this issue be now closed?