Macro internal_error 

macro_rules! internal_error {
    ( $( $arg:tt )+ ) => { ... };
}

Create an internal error.

Example

use apollo_federation::internal_error;
use apollo_federation::error::FederationError;

const NAME: &str = "the thing";
let result: Result<(), FederationError> = may_be_none()
    .ok_or_else(|| internal_error!("Expected {NAME} to be Some"));