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Enable "Useless use of %s in void context" warning for chained comparisons #22969

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Merged
merged 1 commit into from
Feb 9, 2025
Merged

Enable "Useless use of %s in void context" warning for chained comparisons #22969

merged 1 commit into from
Feb 9, 2025

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t-a-k
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@t-a-k t-a-k commented Feb 1, 2025

This particular warning was not issued for chained comparisons such as 1 < $a < 2 in void context.

% perl -we '$a = 1.5; 1 < $a'
Useless use of numeric lt (<) in void context at -e line 1.
% perl -we '$a = 1.5; 1 < $a < 2'
%		# (no warnings)

This change will enable the warning for such cases.

  • This set of changes requires a perldelta entry, and it is included.

@t-a-k
op.c: Enable "Useless use of %s in void context" warning for chained …
dbb176d 
…comparisons

This particular warning is not issued for chained comparisons such as
`1 < $a < 2` in void context before this change.

t/lib/warnings/op: Add tests for this warning.
@scottchiefbaker
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Interesting. Good catch.

@richardleach
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LGTM

@mauke mauke merged commit 225c128 into Perl:blead Feb 9, 2025
@t-a-k t-a-k deleted the warn-cmpchain-void branch February 12, 2025 12:41
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@mauke mauke mauke approved these changes

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@t-a-k @scottchiefbaker @richardleach @mauke