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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
It's pin 1. Check out: http://www.espruino.com/EspruinoESP8266#pinout
Pin 1 is D1 - which is USART1_TX. That's the pin that's used by Espruino to output the REPL.
So if you write to it, it stops Espruino being able to print anything to the REPL any more. It's still working, it's just not printing anything.