eclipse - Type error when mocking Slick Query using ScalaMock: what does "some other" mean? -

i have used java several years, i'm new scala , still trying figure out type system. i'm using scala 2.10.2, slick 1.0.1, , scalamock 2.10-3.0-m4 in eclipse scala ide 3.0.1

i'm trying mock out slick in updatenamebyid using scalamock.

def updatenamebyid(id: int, input: string, users: richtable[object]) = {     users.where(_.id === id).map{ e => e.test }.update(input) }  abstract class richtable[t](name: string = "blank")          extends slick.driver.mysqldriver.simple.table[t](name) {     def id = column[int]("id", o.primarykey, o.autoinc)     def test = column[string]("test") } 

(i'm passing in users: richtable[user] user has complex inheritance hierarchy, i've temporarily removed uses of user simplify example)

users.where returns scala.slick.lifted.query, try mock out follows

class modeltest extends flatspec mockfactory {     def test = {         val mockusers = mock[richtable[object]]         // mockquery definition         val mockquery = mock[scala.slick.lifted.query[richtable[object],             scala.slick.lifted.nothingcontainer#tablenothing]]         (mockusers.where _).expects(*).returns(mockquery)         main.updatenamebyid(1, "asdf", mockusers)     } } 

the mockquery definition gives me these cryptic type errors

type mismatch; found : scala.slick.lifted.query[o(in method union),     scala.slick.lifted.nothingcontainer#tablenothing] required: scala.slick.lifted.query[(some other)o(in method union),     scala.slick.lifted.nothingcontainer#tablenothing]  type mismatch; found : scala.slick.lifted.query[o(in method unionall),     scala.slick.lifted.nothingcontainer#tablenothing] required: scala.slick.lifted.query[(some other)o(in method unionall),     scala.slick.lifted.nothingcontainer#tablenothing] 

i have no idea "o(in method union[all])" vs. "(some other)o(in method union[all])" means, , google hasn't been (it doesn't matters "some other" extremely generic phrase - googling "scala other type error" produces pretty same results "scala type error"). know means and/or how fix type error?