ref: cde7e0d999cf3d56f48d830cf3149f779d86fb31
parent: c74b0bc06994e9a4921131696a5714cf83642acc
author: Ori Bernstein <ori@eigenstate.org>
date: Sat Sep 26 20:29:07 EDT 2015
Add indirect call operator.
This should allow us to split up direct calls and environment
calls. Currently, it doesn't actually do anything.