[MLton] Long identifiers and def-use data

[Stephen Weeks]

> How about reporting both the column of the (short) identifier and, when
> present, the column of the long identifier?

If you have the starting column of the short identifier, I think it's
easy to scan the source backwards and forwards to find:

  1. The start of the long identifier.
  2. The end of the short identifier.
  3. The end of the long identifier.

Right?

Assuming so, I'm all in favor of reporting the starting column of the
short identifier.