Re^3: false warning: print (...) interpreted as function

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Re^4: false warning: print (...) interpreted as function
by ikegami (Patriarch) on Nov 06, 2015 at 18:34 UTC

Your suggestions are wrong.

$ perl -wle'print ((1))'
print (...) interpreted as function at -e line 1.
1
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Because I don't know what do three points ('...') mean and am thinking that a warning is unnecessary.

Ellipses are extremely commonly used in CS as a generic placeholder.

and am thinking that a warning is unnecessary.

The warning was indeed spurious in this case. It's there to catch the following error:

print (4+3)*2;   # Expected to print 14, but prints 7
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Re^5: false warning: print (...) interpreted as function

by Athanasius (Archbishop) on Nov 07, 2015 at 05:58 UTC

Hello ikegami,

Interestingly, this particular warning goes away if the print command is terminated by a semicolon:

15:54 >perl -wle "print ((1))"
print (...) interpreted as function at -e line 1.
1

15:54 >perl -wle "print ((1));"
1

15:54 >
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I get the same behaviour on my various Strawberry Perls, which range from 5.14.4 to 5.22.0.

Seems to be another (strange) heuristic employed by the warnings pragma.

Update: Changed wording of first paragraph (underlined words) to clarify that my comment applies only to cases like ikegami’s example, in which “the statement completed by the semicolon is a complete and unambiguously correct print statement” (BrowserUk, below). See also my earlier post: Re^3: false warning: print (...) interpreted as function.

Cheers,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

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Re^6: false warning: print (...) interpreted as function

by BrowserUk (Patriarch) on Nov 07, 2015 at 06:30 UTC

Only if the statement completed by the semicolon is a complete and unambiguously correct print statement:

print ((1)), 1;;
print (...) interpreted as function at
1
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With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority". I knew I was on the right track :)

In the absence of evidence, opinion is indistinguishable from prejudice.

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Re^6: false warning: print (...) interpreted as function

by AnomalousMonk (Archbishop) on Nov 07, 2015 at 06:20 UTC

... the warning goes away if the print command is terminated by a semicolon ...

Likewise ActiveState 5.8.9 and Strawberries 5.10.1.5 and 5.12.3.0.

Give a man a fish: <%-{-{-{-<

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Re^4: false warning: print (...) interpreted as function
by hippo (Archbishop) on Nov 06, 2015 at 14:12 UTC

I don't know what do three points ('...') mean

It's an ellipsis.

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