[m-rev.] for post-commit review: fix deconstructing direct_args

[Zoltan Somogyi]

For review by anyone.

Before you ask, I know that the data structures and functions involved
should have more comprehensive documentation, but the level of
understanding required for that significantly exceeds the level required
for this bug fix, so I think it better to leave that task for the next bug
that does require that higher level.

Zoltan.
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