:: String -> HostPreference package:clash-prelude

Same as error but will make HDL generation fail if included in the final circuit. This is useful for the error case of static assertions. Note that the error message needs to be a literal, and during HDL generation the error message does not include a stack trace, so it had better be descriptive.

Like error, but throwing an XException instead of an ErrorCall The ShowX methods print these error-values as undefined; instead of error'ing out with an exception.