the test (I saw this test failing before) in question is some kind of hack:
sage: try:
alarm(0.5)
singular._expect_expr('>') # interrupt this
except KeyboardInterrupt:
pass ## line 505 ##
Control-C pressed. Interrupting Singular. Please wait a few seconds...
sage: 2*a ## line 514 ##
------------------------------------------------------------------------
/home/chapoton/sage/local/lib/python3.8/site-packages/cysignals/
signals.cpython-38-x86_64-linux-gnu.so(+0x7df4)[0x7f7c33af8df4]
....
perhaps a kind of race condition - I don't want to think what happens
if Control-C does not propagate quickly enough to suspend
Singular.
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