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test goto __SUB__ #23815

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Merged
merged 2 commits into from
Oct 6, 2025
+18 −3
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test goto __SUB__ #23815

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e7240d2
test 'goto __SUB__' tail recursion
mauke Oct 5, 2025
cec2e30
t/op/goto-sub.t: remove extra newline from TAP output
mauke Oct 5, 2025
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21 changes: 18 additions & 3 deletions t/op/goto-sub.t
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Original file line number Diff line number Diff line change
Expand Up @@ -7,10 +7,10 @@ BEGIN {
require './charset_tools.pl';
}

use v5.16;
use warnings;
use strict;
use Config;
plan tests => 40;
plan tests => 41;

# Excerpts from 'perldoc -f goto' as of perl-5.40.1 (Aug 2025)
#
Expand Down Expand Up @@ -61,7 +61,7 @@ our $foo;

sub f1 {
my $x;
goto sub { $x=0; ok(1,"don't prematurely free CV\n") }
goto sub { $x=0; ok(1, "don't prematurely free CV"); };
}
f1();

Expand Down Expand Up @@ -358,6 +358,21 @@ SKIP:
}


# GH 23804 goto __SUB__
{
my $fac = sub {
unshift @_, 1;
goto sub {
my ($acc, $i) = @_;
return $acc if $i < 2;
@_ = ($acc * $i, $i - 1);
goto __SUB__;
};
};

is $fac->(5), 120, 'recursion via goto __SUB__';
}

# Final test: ensure that we saw no deprecation warnings
# ... but rework this to count fatalizations once work is more developed

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