Remove unused variable

Change-Id: I20a17d8d1af0027e4be17eb067c61204c41b0f7c
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Keep track of the currently code currently being run through eval()

We need to keep track of the possibly recursive eval calls for back trace
functionality in the future as well as changes to the exception handling.

Change-Id: Ie8a9343dfe43754fee48bab4b96b4ec2ab1fb67b
Reviewed-by: Lars Knoll <lars.knoll@digia.com>