test_runner.t fails on Perl 5.38.0 GNU/Linux

[bodo-hugo-barwich]

FAIL Process-SubProcess-2.1.2 5.38.0 GNU/Linux

------------------------------
PROGRAM OUTPUT
------------------------------

Output from '/usr/bin/make test':

PERL_DL_NONLAZY=1 "/home/david/cpantesting/perl-5.38.0-SILENT_NO_TAINT/bin/perl" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/test_group.t ........ ok
t/test_performance.t .. ok
Can't modify undef operator in scalar assignment at t/test_runner.t line 154, near "undef;"
Execution of t/test_runner.t aborted due to compilation errors.
t/test_runner.t ....... 
Dubious, test returned 255 (wstat 65280, 0xff00)
No subtests run 
t/test_subprocess.t ... ok

Test Summary Report
-------------------
t/test_runner.t     (Wstat: 65280 (exited 255) Tests: 0 Failed: 0)
  Non-zero exit status: 255
  Parse errors: No plan found in TAP output
Files=4, Tests=12, 62 wallclock secs ( 0.12 usr  0.02 sys +  2.80 cusr  0.55 csys =  3.49 CPU)
Result: FAIL
Failed 1/4 test programs. 0/12 subtests failed.
make: *** [Makefile:883: test_dynamic] Error 255

[bodo-hugo-barwich]

Earlier versions of Perl accepted missing semicolon still as parte of a concatenated declaration.
But recent versions correctly accuse this as an error because it can have undesired side effects.