Fix module completion error after a dot

[zachallaun]

I'm having trouble replicating this in a test, but I was getting an error when I tried completing something like:

defmodule Something do
  alias Lexical.|
end

The error was caused by an exception thrown in analysis due to an incorrect case in its reify_alias implementation. The analyzer deals with modules as lists of segments, e.g. [:Foo, :Bar, :Baz], but the macro env requires that they be combined to Foo.Bar.Baz.

[scohen]

crazy, this works great for me.

[zachallaun]

I think it may be VS Code specific, possibly to do with single-char completions.

[scohen]

The gift that keeps on giving.

[scohen]

I'm a little worried about the lack of a unit test. Would it be possible to either

1. Make a very specific unit test targeting env
2. Use patch to expose refiy_alias and test that way