Macro unwrap_or_panic 

macro_rules! unwrap_or_panic {
    ($result:expr) => { ... };
    ($result:expr, $context:expr) => { ... };
}

Macro to unwrap a Result or panic with the error message. This is a cleaner replacement for .unwrap_or_else(|error| panic!("{}", error)).

Usage

let value = unwrap_or_panic!(expr_to_num(&arg, state, traversal_state, fns));
// Or with additional context:
let value = unwrap_or_panic!(expr_to_num(&arg, state, traversal_state, fns), "Converting to number");

Arguments

• $result: A Result type to unwrap
• $context (optional): Additional context string to prepend to the error message