Use of eval in a function wraps it in a context.
This throws off assumptions not checked until later,
which is at odds with incremental validation and conversion.
Check that module parameters are PARAMETER location early.

BUG=672045
R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2558813004
Cr-Commit-Position: refs/heads/master@{#41594}