Module:CallAssert

 localfunctionpack(...)
 return{...},select('#',...)
 end

 localfunctionmapArray(func,array,count)
 localresult={}
 fori=1,countor#arraydo
 result[i]=func(array[i])
 end
 returnresult
 end

 localfunctionquote(value)
 iftype(value)=='string'then
 return(string.gsub(string.format('%q',value),'\\\n','\\n'))-- Outer parentheses remove second value returned by gsub
 end
 localstr=tostring(value)
 iftype(value)=='table'andstr~='table'then
 return'{'..str..'}'
 end
 returnstr
 end

 localfunctioncallAssert(func,funcName,...)
 localresult,resultCount=pack(func(...))
 ifnotresult[1]then
 localargs,argsCount=pack(...)
 args=mapArray(quote,args,argsCount)
 localmessage=mw.ustring.format(
 '%s(%s) failed',
 funcName,
 table.concat(args,', ')
 )
 error(message,2)
 end
 returnunpack(result,1,resultCount)
 end

 returncallAssert