Commit limit causes assertion failure

[ellerh]

The attached program terminates with this message:

The MPS detected a problem!
trace.c:1088: MPS ASSERTION FAILED: band != RankWEAK || rank == band
See the "Assertions" section in the reference manual:
https://www.ravenbrook.com/project/mps/master/manual/html/topic/error.html#assertions
Aborted

The program sets a commmit limit, creates a weak array and then creates a long list.
The assertion is not always triggered; it seems to depend on the commit limit and the size of the weak array.

I suspect that the AMC pool is in emergency mode and that in emergency mode the assumptions made by the assertion don't hold.

commit_limit_test.c