[rt.cpan.org #85336] Fails often when tested in parallel

[Ed J via RT]

<URL: https://rt.cpan.org/Ticket/Display.html?id=85336 >

I'd be very interested to know whether the change proposed in 
https://github.com/mohawk2/inline-pm/commit/9fef7cfbd731249579deb3510d96a318115a0928
 fixes this issue.