[m-rev.] for post-commit review: fix some debug grade test failures

[Zoltan Somogyi]

For review by anyone.

Zoltan.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Log.dbg
Type: application/octet-stream
Size: 2707 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20220626/990d3e22/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DIFF.dbg
Type: application/octet-stream
Size: 9599 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20220626/990d3e22/attachment-0001.obj>