If you ever screw up the whitespace, it's possible that the mistake won't show up in common diffing software, because most diffing software is designed with the assumption that whitespace is insignificant (and hard to display).
Ironically, as soon as you need a tool to make whitespace visible in order to determine which delimiter you're using where, you're just using C-style braces again, only now there are two kinds of braces, which are incompatible, and otherwise visually indistinguishable.
