Handle defmodule cases in s-exp
Handle defmodule cases in s-exp

This is another special case. Instead of `(defmodule Foo)` it will only
return the module name.

Note that we only return the module name if it's actually only a module
and not found in the type environment.

carp-lang/Carp,eriksvedang/Carp,carp-lang/Carp,eriksvedang/Carp,carp-lang/Carp