As finds the first error in err's tree that matches target, and if one is found, sets target to that error value and returns true.

ContainsStackTrace returns true if the given error contain the stack trace.

Errorf creates a new error with the given format and values.

ErrorStack returns an stack trace if available.

Is reports whether any error in err's tree matches target.

IsContextCanceled returns `true` if error has occurred by event `context.Canceled` which is not really an error.

IsError returns true if actual is the same type of error as expected.

Join returns an error that wraps the given errors.

New creates a new instance of Error.

Recover tries to recover from panics, and if it succeeds, calls the given onPanic function with an error that explains the cause of the panic.

Unwrap returns the result of calling the Unwrap method on err, if err's type contains an Unwrap method returning error.

UnwrapErrors unwraps all nested multierrors, and errors that were wrapped with `fmt.Errorf("%w", err)`.

UnwrapMultiErrors unwraps all nested multierrors into error slice.

MultiError is an error type to track multiple errors.