Weird error in a dot call

```
iex(4)> 4.integer_to_binary
** (SyntaxError) iex:4: unexpected parenthesis after 4 . :integer_to_binary
    lists.erl:1329: :lists.mapfoldl/3
    src/elixir.erl:131: :elixir.eval_forms/3
```

I see no parenthesis in the code.
