Edge: SCRIPT1028: Expected identifier, string or number

Question

My page works fine in Chrome and Firefox:

However, when I try to load this page in Edge, the questions and answers disappear. Only the categories are posted. Also,

Answer 1

Edge 44 fails with "SCRIPT1028: Expected identifier, string or number" with :

var a = {};
a = { ...a};

But succeeded with:

var a = {};
a = Object.assign({}, a);