ceylon/ceylon-js — comment on commit 309c4e281a7f9e4934d6608877219863069c870a
File:  line 0
By chochos:

Ah... Singleton's value was [elem] and now it's just elem, which breaks nonempty(); Singleton is a sequence, even if it's a 1-element sequence, so its value should be an array.

I'm pushing a fix which should be ready by the time you read this.