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Thank you for your advice.  I have updated the patch for
HEAD (r50793).  It passes "make EXTRATESTOPTS=-unetwork
test" except for test_compile, which fails test_unary_minus.

Should I try to write the test?  I think that it could try
to accept() and another thread could send a signal.  I think
it would have to be separate from all the other tests, which
are threaded, so that it won't interfere with them.