Re: Problem with ``use if COND, Some::Module'' on Linux

The "hint" in the error message provides a big clue.

The arguments to use if are evaluated in list context. Therefore the match expressions are being evaluated in list context.

From the Perl documentation: "When there are no parentheses in the pattern, the return value is the list (1) for success. With or without parentheses, an empty list is returned upon failure."

So, on a non-MSwindows platform, $^O =~ /MSWin/ is returning an empty list.

Of course, on MSwindows, $^O !~ /MSWin/ is failing, but because it has an implied not, it is equivalent to not ($^O =~ /MSWin/) so is returning a non-empty false value.

Comment on Re: Problem with ``use if COND, Some::Module'' on Linux Select or Download Code

Replies are listed 'Best First'.
Re^2: Problem with ``use if COND, Some::Module'' on Linux by stevieb (Canon) on Apr 08, 2016 at 17:50 UTC
aahhhh, yep, that does make sense. Rubber D^H^H^H^H^H^H^H^HPerlmonks Debugging saves the day once again :) Cheers!	[reply]
Re^3: Problem with ``use if COND, Some::Module'' on Linux by RonW (Parson) on Apr 08, 2016 at 18:14 UTC
Quack	[reply]