Struct main_error::MainError

pub struct MainError(_);

Newtype wrapper around a boxed std::error::Error.

• It implements Debug so that it can be used in fn main() -> Result<(), MainError>.
• It implements From<E> for E: Into<Box<dyn Error>> so that it works as a drop-in for any type that can be converted into a boxed Error (i.e., an Error trait object).

MainError can only be constructed through its From impl: Explicitly with from/into or implicitly through the ? operator.

Example

Explicit construction via MainError::from:

let e = MainError::from("something convertible to Box<dyn Error>");

Or via into() when the target type can be inferred from the context:

fn main() -> Result<(), MainError> {
    Err("something convertible to Box<dyn Error>".into())
}

Or even easier via ?:

fn main() -> Result<(), MainError> {
    Err("something convertible to Box<dyn Error>")?
}

Trait Implementations

impl Debug for MainError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<E: Into<Box<dyn Error>>> From<E> for MainError

fn from(e: E) -> Self

Performs the conversion.