Why do I get the error below? How to workaround it?
I assumed that since A and B compile to (interface,class) pairs, it's a matter of choosing the right static method call to implement when compiling C. I would expect the priority to be according to order.
scala> trait A { def hi = println("A") }
defined trait A
scala> trait B { def hi = println("B") }
defined trait B
scala> class C extends B with A
<console>:6: error: error overriding method hi in trait B of type => Unit;
method hi in trait A of type => Unit needs `override' modifier
class C extends B with A
scala> trait A { override def hi = println("A") }
<console>:4: error: method hi overrides nothing
trait A {override def hi = println("A")}
Note that in Ruby this works well:
>> module B; def hi; puts 'B'; end; end
=> nil
>> module A; def hi; puts 'A'; end; end
=> nil
>> class C; include A; include B; end
=> C
>> c = C.new
=> #<C:0xb7c51068>
>> c.hi
B
=> nil