You can't omit parens on subs that haven't been declared. Either add parens to THREAD_PRIORITY_BELOW_NORMAL, or import the constant before THREAD_PRIORITY_BELOW_NORMAL is compiled (in which case you'll get true constant).

In reply to Re: require Win32::Process, barewords "THREAD_PRIORITY_BELOW_NORMAL" not allowed? by ikegami
in thread require Win32::Process, barewords "THREAD_PRIORITY_BELOW_NORMAL" not allowed? by appleii

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