3 tests failures: Test_call_func_with_null, Test_null_default_argument, Test_null_return

[dpelle]

Steps to reproduce

3 tests fail when doing:

$ cd vim/src
$ ./configure --with-features=normal --enable-gui=none --disable-channel
$ make -j12
$ make test_vim9_func
…
Executed 153 tests                       in   2.972407 seconds
3 FAILED:
Found errors in Test_call_func_with_null():
Caught exception in Test_call_func_with_null(): Vim(defcompile):E1001: Variable not found: null_channel @ command line..script /home/pel/sb/vim/src/testdir/runtest.vim[456]..function RunTheTest[44]..Test_call_func_with_null[33]..<SNR>9_CheckDefAndScriptSuccess[1]..<SNR>9_CheckDefSuccess[6]..script /home/pel/sb/vim/src/testdir/XdefSuccess37[33]..function Func[22]..<lambda>11, line 1
Found errors in Test_null_default_argument():
Caught exception in Test_null_default_argument(): Vim(defcompile):E1001: Variable not found: null_channel @ command line..script /home/pel/sb/vim/src/testdir/runtest.vim[456]..function RunTheTest[44]..Test_null_default_argument[33]..<SNR>9_CheckDefAndScriptSuccess[1]..<SNR>9_CheckDefSuccess[6]..script /home/pel/sb/vim/src/testdir/XdefSuccess239[33]..function Func[22]..<lambda>156
Found errors in Test_null_return():
Caught exception in Test_null_return(): Vim(defcompile):E1001: Variable not found: null_channel @ command line..script /home/pel/sb/vim/src/testdir/runtest.vim[456]..function RunTheTest[44]..Test_null_return[33]..<SNR>9_CheckDefAndScriptSuccess[1]..<SNR>9_CheckDefSuccess[6]..script /home/pel/sb/vim/src/testdir/XdefSuccess240[33]..function Func[22]..<lambda>162, line 1
SKIPPED Test_compiling_error(): cannot run Vim in a terminal window
SKIPPED Test_function_python(): python3 feature missing
SKIPPED Test_opfunc_error(): cannot make screendumps
SKIPPED Test_silent_echo(): cannot make screendumps
Makefile:63: recipe for target 'test_vim9_func' failed
make: *** [test_vim9_func] Error 1

Expected behaviour

All tests should pass.

Version of Vim

8.2.4554

Environment

xubuntu-18.04.6 (x86_64)

Logs and stack traces

No response