better definition of is_working

6 jobs for work-conserving-edf in 3 minutes and 42 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #47333
1.8.0-coq-8.8

00:02:12

passed #47335
1.9.0-coq-8.9

00:02:05

failed #47334
allowed to fail
1.9.0-coq-dev

00:00:15

 
  Process
passed #47337
doc

00:00:25

passed #47338
proof-length

00:00:15

passed #47336
validate

00:01:30

 
Name Stage Failure
failed
1.9.0-coq-dev Build There is an unknown failure, please try again
COQC util/powerset.v
COQC util/seqset.v
File "./util/seqset.v", line 19, characters 42-52:
Error: The reference mkPredType was not found in the current environment.

make[1]: *** [Makefile:670: util/seqset.vo] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:324: all] Error 2
ERROR: Job failed: exit code 1