Macro tracerr::from_and_wrap[−][src]

macro_rules! from_and_wrap {
    () => { ... };
    ($from:ty) => { ... };
    (=> $to:ty) => { ... };
    ($from:ty => $to:ty) => { ... };
}

Expand description

Provides a closure, which captures new Frame in the invocation place, applies required From implementation for the given error and wraps it into Traced wrapper containing this Frame. If the error is a Traced already then just growth its Trace with the captured Frame.

Examples

use tracerr::Traced;

let res: Result<(), u8> = Err(7);
let err: Traced<u64> = res.map_err(tracerr::from_and_wrap!()).unwrap_err();