Handle type restrictions

[dbrgn]

Handle type restrictions

[dbrgn]

• rust-lang/rfcs#671
• https://www.reddit.com/r/rust/comments/3p1vgg/ranges_for_integer_data_types/

[dns2utf8]

we could test every function with:

fn validate_1_n(arg: i32) {
  assert!(arg > 1, "You shall not pass a number lower than 1");
}

Maybe extend it with https://github.com/alexcrichton/backtrace-rs to display nicer messages including the calling function.

[dbrgn]

If it happens at runtime, I'd rather go with something like TryFrom and return a Result.

[rnestler]

Yeah definitely go with Result for input parsing.