Make use of the list() feature where it makes sense

Make use of the list() feature where it makes sense

This code is functionally identical, but less error prone (not so easy
to forget or mix these numerical indexes).

This patch happens to touch the Parser, which might be a bit scary. We
can remove this file from this patch if you prefer.

Change-Id: I8cbe3a9a6725d1c42b86e67678c1af15fbc5961a