Bug #107365 for Proc-Simple: Proc::Simple somehow messes up ${^CHILD_ERROR_NATIVE}

Hello, creating an Proc::Simple object (and starting a process) seems to affect the outcome of running another child process using system(): The ${^CHILD_ERROR_NATIVE} variable is set to -1 even if the child exited zero, breaking code that checks it. The Test::Command module does. Reproducer: =================================================================== #!/usr/bin/perl use strict; use warnings; use Test::More; use Proc::Simple; my $p = Proc::Simple->new; $p->start (sub { sleep 5; }); is (${^CHILD_ERROR_NATIVE}, 0, 'CHILD_ERROR_NATIVE value before system()'); system ('true'); is (${^CHILD_ERROR_NATIVE}, 0, 'CHILD_ERROR_NATIVE value after system()'); is ($?, 0, 'child exit code'); done_testing; =================================================================== Expected: Pass. Comment the '$p->start' line to see it working. Observed behaviour: Check 2 of 3 fails. Tested using Debian squeeze (Proc::Simple 1.26) and Debian stretch (Proc::Simple 1.31). Workaround: Don't use system, use another Proc::Simple and ->wait instead. This however means I'd have to avoid Test::Command altogether. FWIW, the fix suggested in #43276 did not help. Christoph