Macro anyerr

macro_rules! anyerr {
    ($fmt:literal) => { ... };
    ($fmt:literal$(, $($arg:expr),* $(,)?)?) => { ... };
    ($err:expr) => { ... };
}

Converts a value into [AnyError], or formats a message.

• anyerr!("msg") formats a message.
• anyerr!(value) converts StackError, std error, or Display in [AnyError].

This uses autoref specialization to use the most details available: if given a [StackError] it uses [AnyError::from_stack], if given a std error, uses [AnyError::from_std], if given a value that impls Display it uses [AnyError::from_display] - in this order.