Mavryk_expect_helper
val require_does_not_raise : loc:string -> (unit -> unit) -> unit
require_does_not_raise ~loc f calls f (). If it raises, print an error with the exception raised.
require_does_not_raise ~loc f
f ()
val require_does_raise : loc:string -> (unit -> unit) -> unit
require_does_raise ~loc f calls f () and prints the exception raised. If it doesn't raise, print an error.
require_does_raise ~loc f