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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.
Ganblejs
Found out what it was - it's a lock leak when using flash strings as property names in objects. It'd end up leaking memory pretty much whenever you display a menu, so it's good to have found it! Actually fixing it is proving problematic though...
And annoyingly it's nothing to do with the pretokenisation changes - it's just that they happened to pick it up.
edit: Fixed!