panic library
Functions
- 
  panic([String? msg]) → Never 
- Shorthand for
- 
  unreachable([String msg = "This code should be unreachable."]) → Never 
- Shorthand for
Exceptions / Errors
- Panic
- 
  As with Error, Panic represents a state that should never happen and thus is not expected to be catch.
This is closely tied to the unwrapmethod of both Option and Result types.
- Unreachable
- Indicates unreachable code. This is useful any time that the compiler can’t determine that some code is unreachable. For example: