MERCURY_OPTIONS= --deep-random-write=25 --mdb-disable-progress
make[3]: Entering directory '/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/tests/valid'
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --generate-dependencies --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510 > bug510.dep_err 2>&1
make[3]: Leaving directory '/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/tests/valid'
make[3]: Entering directory '/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/tests/valid'
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --make-short-interface --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510b
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --make-interface --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510b
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --make-short-interface --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510a
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --compile-to-c --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510b > bug510b.err 2>&1
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --make-interface --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510a
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --make-interface --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --compile-to-c --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510 > bug510.err 2>&1
make[3]: *** [/tmp/mmake.YIXVwi:2680: bug510.c_date] Error 1
/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/stage2/scripts/mmc --compile-to-c --grade hlc.par.gc     --mercury-linkage static --flags ../TESTS_FLAGS --flags ../WS_FLAGS     bug510a > bug510a.err 2>&1
make[3]: Target 'bug510.runtest' not remade because of errors.
make[3]: Leaving directory '/mnt/testing/run/build/mercury-srcdist-rotd-2022-01-25/tests/valid'
ERROR OUTPUT
Uncaught Mercury exception:
Software Error: map.lookup: key not found
	Key Type: string
	Key Value: "sparse_bitset"
	Value Type: tree234.tree234(parse_tree.prog_data.type_ctor, hlds.hlds_data.hlds_type_defn)
END OF THE ERROR OUTPUT