Fix issue with namespace definition lookup

alchemist-server/lib/source.exs

@@ -46,6 +46,12 @@ defmodule Alchemist.Source do
   end
   defp source(module), do: do_source(module)
 
+  defp do_source([head|tail]) do
+    [head] ++ tail
+    |> Module.concat
+    |> do_source
+  end
+
   defp do_source(module) do
     if Code.ensure_loaded? module do
       case module.module_info(:compile)[:source] do

alchemist-server/test/source_test.exs

@@ -31,6 +31,11 @@ defmodule SourceTest do
     assert find([String, nil, context]) =~ "lib/elixir/lib/string.ex"
   end
 
+  test "find call with module namespace" do
+    context = [context: Elixir, imports: [], aliases: []]
+    assert find([String.Chars, :to_string, context]) =~ "lib/elixir/lib/string/chars.ex"
+  end
+
   test "find call for erlang module" do
     context = [ context: Elixir, imports: [], aliases: [] ]
     assert find([:lists, :duplicate, context]) =~ "lib/stdlib/src/lists.erl"
@@ -40,5 +45,4 @@ defmodule SourceTest do
     context = [ context: Elixir, imports: [], aliases: [] ]
     assert find([Rock, :duplicate, context]) == nil
   end
-
 end