The draw_net_input() function can write additional statements to the output
file, so must not be called in the midst of writing a statement.
(cherry picked from commit e53b2e774b)
By adding ivtest to the iverilog source tree, it is easier to keep
the regression test synchronized with the source that is being tested.
This should be especially helpful for PRs that add a new feature, and
have a matching ivtest PR with the regression test for that feature.
Martin Whitaker
Stephen Williams