Let assert

let assert is another way to intentionally crash your Gleam program. It is similar to the panic keyword in that it crashes when the program has reached a point that should never be reached.

let assert is similar to let in that it is a way to assign values to variables, but it is different in that the pattern can be partial. The pattern does not need to match every possible value of the type being assigned.

Just like panic and todo, the as keyword can be used with let assert to supply a custom panic message if the pattern fails to match and the program crashes.

Like panic this feature should be used sparingly, and likely not at all in libraries.