Implementing binary operations on generic class in scala -

i having multiple compile errors trying write class definition this.

      trait binops[t] {       def +(that: vector[t]): vector[t]       def -(that: vector[t]): vector[t]       def *(that: vector[t]): vector[t]       def /(that: vector[t]): vector[t]     }      trait vector[t] {       def tolist(): list[t]       def zeros(length: int): vector[t]     }      object vector {       def apply[t](args: t*): vector[t] = new vectorimpl[t](args.tolist)        private class vectorimpl[@specialized(double, int, float, long)t](val _data: list[t])         extends vector[t]         binops[t] {         def +(that: vector[t]): vector[t] = new vectorimpl[t](_data.zip(that).map(elem => elem._1 + elem._2))         def -(that: vector[t]): vector[t] = new vectorimpl[t](_data.zip(that).map(elem => elem._1 - elem._2))         def *(that: vector[t]): vector[t] = new vectorimpl[t](_data.zip(that).map(elem => elem._1 * elem._2))         def /(that: vector[t]): vector[t] = new vectorimpl[t](_data.zip(that).map(elem => elem._1 / elem._2))          def fill(length: int, value: t): vector[t] = new vectorimpl[t](list.fill[t](length)(value))         def tolist(): list[t] = _data.tolist       }        implicit def vectortolist[t](v: vector[t]): list[t] = v.tolist     }  

i getting errors these..

     error:(36, 102) type mismatch;      found   : t      required: string         def +(that: vector[t]): vector[t] = new vectorimpl[t](_data.zip(that).map(elem => elem._1 + elem._2))                                                                          ^        error:(37, 95) value - not member of type parameter t         def -(that: vector[t]): vector[t] = new vectorimpl[t](_data.zip(that).map(elem => elem._1 - elem._2))                                                                          ^ 

however doing zip should have resulted in tuple type t , trying access first , second elements. doing wrong ?

error:(37, 95) value - not member of type parameter t

this real error (the 1 strings unfortunate consequence of implicit conversion in predef - recommend building -yno-predef avoid such misleading errors). t unconstrained - - supposed do? e.g. if t locale - locale.english - locale.spanish? doesn't compile.