interface UniqueNames {
  name: String
}

extend interface UniqueNames {
  name: String
}

directive @nonRepeatable on INTERFACE

interface Directives @nonRepeatable {
  age: Int
}

extend interface Directives @nonRepeatable

interface Base {
  a: Int
  b: Int
  c: Int
}

interface Derived {
  a: Int
}

extend interface Derived implements Base {
  c: Int
}

type Query {
  x: Int
}