fix warnings

Author: lukaszsamson

apps/language_server/lib/language_server/providers/document_symbols.ex

@@ -61,7 +61,7 @@ defmodule ElixirLS.LanguageServer.Providers.DocumentSymbols do
   end
 
   # handle a bare defimpl, defprotocol or defmodule
-  defp extract_modules({defname, _, nil} = ast)
+  defp extract_modules({defname, _, nil})
        when defname in [:defmodule, :defprotocol, :defimpl] do
     []
   end

apps/language_server/test/source_file_test.exs

@@ -1,7 +1,6 @@
 defmodule ElixirLS.LanguageServer.SourceFileTest do
   use ExUnit.Case, async: true
   use ExUnitProperties
-  import ElixirLS.LanguageServer.Test.PlatformTestHelpers
 
   alias ElixirLS.LanguageServer.SourceFile