I have had trouble compiling under the latest staging version.
http://arduino.esp8266.com/versions/1.6 ... index.json
That is the latest version of the esp8266 arduino stuff that will work to compile the basic interpreter and have it run as expected.
http://esp8266basic.com
A BASIC interpreter for your ESP
Working now on Autodrop3d. A 3d printer with automatic part ejection system. https://autodrop3d.com