lme4::lFormula() does no longer fail during input checks for inputs it did before. The input is still illegal but the error only appears when actually fitting lme4::lmer(). It is caught there but the error is not reported with the standard method check_err_msg() but simply with stop(). Replace stop() with check_err_msg() and adapt tests which still checked for the old message.
lme4::lFormula()does no longer fail during input checks for inputs it did before. The input is still illegal but the error only appears when actually fittinglme4::lmer(). It is caught there but the error is not reported with the standard methodcheck_err_msg()but simply withstop(). Replacestop()withcheck_err_msg()and adapt tests which still checked for the old message.