Test runnable/gdb1.d failed.  The logged output:
/build/dmd/generated/linux/release/64/dmd -conf= -m64 -Irunnable -g -fPIC  -odtest_results/runnable -oftest_results/runnable/gdb1_0  runnable/gdb1.d
gdb test_results/runnable/gdb1_0 --batch -x test_results/runnable/gdb1_0.gdb
Breakpoint 1 at 0x401147: file ../../druntime/import/core/internal/entrypoint.d, line 29.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/nix/store/a6rnjp15qgp8a699dlffqj94hzy1nldg-glibc-2.32/lib/libthread_db.so.1".

Breakpoint 1, main (argc=3, argv=0x7fffffffbcf8) at ../../druntime/import/core/internal/entrypoint.d:29
29                  return _d_run_main(argc, argv, &_Dmain);
RESULT=test_results/runnable/gdb1_0.gdb:5: Error in sourced command file:
No symbol "args" in current context.


==============================
Test runnable/gdb1.d failed: expected rc == 0, exited with rc == 1

make[1]: *** [Makefile:156: test_results/runnable/gdb1.d.out] Error 1
make[1]: *** Waiting for unfinished jobs....
 ... runnable/funclit.d             -fPIC (-inline -release -g -O)
 ... runnable/functype.d            -fPIC (-inline -release -g -O)
 ... runnable/foreach4.d            -fPIC (-inline -release -g -O)
make: *** [Makefile:188: start_runnable_tests] Error 2
make: Leaving directory '/build/dmd/test'
builder for '/nix/store/yd9ala0sf8djwv637yn3ac3b9wxnv373-dmd-2.091.1.drv' failed with exit code 2
cannot build derivation '/nix/store/vjbys073bhalq3kf69y2iaafp5gdz19n-dub-1.23.0.drv': 1 dependencies couldn't be built
error: build of '/nix/store/vjbys073bhalq3kf69y2iaafp5gdz19n-dub-1.23.0.drv' failed