Function interp_hashmap 

fn interp_hashmap(
    _args: &[RValue],
    _named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Create an empty HashMap (unordered key-value store).

Returns an integer ID with class “hashmap”. Use hashmap_set(), hashmap_get(), etc. to manipulate it.

@return integer scalar with class “hashmap”