Make self type required for completion

[vinistock]

Completion is based on two things, depending on the scenario:

1. Either the receiver type or lexical scope
2. The type of self (which is not always the same as the lexical scope)

We were making the type of self optional before, but the reality is that we always need it. Consider this example:

class Foo
  # completion here

  def bar
    # and completion here
  end
end

In both cases, the lexical scope is the same, but the type of self is different Foo::<Foo> vs Foo. We already provide the tools for consumers to figure out the type of self for these cases, so let's make it required in the API in order to provide correct completion.

[vinistock]

• Make self type required for completion #794 👈 (View in Graphite)
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