Enum PromiseErr 

pub enum PromiseErr {
    ChannelBroken,
    AlreadyFulfilled,
}

An error returned when a promise can’t be fulfilled.

Variants

ChannelBroken

Indicates that the paired future was already dropped.

AlreadyFulfilled

Indicates that this promise has somehow been fulfilled before.

Trait Implementations

impl Debug for PromiseErr

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

Formats the value using the given formatter.

impl Display for PromiseErr

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

Formats the value using the given formatter.

impl Error for PromiseErr

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.