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Add test and docs about multiple identical block labels #23259

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May 8, 2025
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Add test and docs about multiple identical block labels #23259

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4 changes: 3 additions & 1 deletion pod/perlsyn.pod
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Original file line number Diff line number Diff line change
Expand Up @@ -330,7 +330,9 @@ If the LABEL is omitted, the loop control statement
refers to the innermost enclosing loop. This may include dynamically
searching through your call-stack at run time to find the LABEL. Such
desperate behavior triggers a warning if you use the C<use warnings>
pragma or the B<-w> flag.
pragma or the B<-w> flag. If more than one label with the same name
occurs, any reference to that name refers to the one labelling the
innermost enclosing loop.

If the condition expression of a C<while> statement is based
on any of a group of iterative expression types then it gets
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19 changes: 18 additions & 1 deletion t/op/loopctl.t
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Expand Up @@ -36,7 +36,7 @@ BEGIN {
set_up_inc(qw(. ../lib));
}

plan( tests => 67 );
plan( tests => 69 );

my $ok;

Expand Down Expand Up @@ -922,6 +922,23 @@ TEST41: {
}
cmp_ok($ok,'==',1,'dynamically scoped');

TEST42: { # GH #18369
my $outer = 0;
my $inner = 0;
L:
for my $i (0 .. 0) {
$outer++;

L:
for my $j (0 .. 0) {
$inner++;
redo L if $inner < 10;
}
}

is ($inner, 10, "redo label refers to innermost enclosing one");
is ($outer, 1, "redo label doesn't refer to outermost enclosing one");
}

# [perl #27206] Memory leak in continue loop
# Ensure that the temporary object is freed each time round the loop,
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