Later we want to automatically declare the parameters while parsing,
which moves the declaration before body parsing anyway. This is just
a step in that direction, making sure that it works.

Change-Id: I0645269aa26643de138848c599cfe5d1ad4bf32c
Reviewed-on: https://chromium-review.googlesource.com/c/1384319Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58376}