If modules have types that have the same name, the interfaces generator creates invalid references to the default module.

[scotttrinh]

Given the SDL:

module default {
  type Foo {}
}

module Bar {
  type Foo extends default::Foo {}
}

The interfaces generator will try to reference the default::Foo type without any sort of qualifier, so it ends up with something like:

namespace Bar {
  export interface Foo extends Foo {}
}