Rust nearly has that same benefit. You can wrap `parse_json_stream(f_in)` in `try!(parse_json_stream(f_in))`, and if an error was returned from `parse_json_stream`, then an early return for `load_data` is inserted automatically, thereby propagating the error, similar to raising an exception.
Of course, these approaches are not isomorphic, but in Rust, the cost of explicitly checking an error value is typically very small thanks to algebraic data types, polymorphism and macros.
Of course, these approaches are not isomorphic, but in Rust, the cost of explicitly checking an error value is typically very small thanks to algebraic data types, polymorphism and macros.