Re^2: How does 'goto LABEL' search for its label? (do-blocks)

[LanX]

in reply to Re: How does 'goto LABEL' search for its label? (call stack)
in thread How does 'goto LABEL' search for its label?

> As for there being a new warning for if(1){X:...} goto X:, I lack the details for why this got deprecated.

It's analogous to if(0) the constant block is optimized to a do-block¹ ...

> perl -MO=Deparse -E'if (1) { label: say 1;}; goto label'
BEGIN {
    $^H{'feature_say'} = q(1);
    $^H{'feature_state'} = q(1);
    $^H{'feature_switch'} = q(1);
}
do {
    label: say 1
};
goto label;

... which seems to fall into the same category like other loop-like-blocks:

ATM I have only 5.10 available. Could someone please test this with >= 5.12?

perl -wE'do { label: say 1;}; goto label'

EDIT: removed exit

Update

here test code w/o endless looping.

perl -wE'my $x=0;do { label: say $x++; die if $x>1}; goto label'
0
1
Died at -e line 1.

Update

Thanks to davido for testing

[davido]: LanX: perl -E 'goto IN; do{ IN: say "Hello world\n";};' does
+ produce the warning on 5.16.2.

¹) which is somehow strange, I expected a simple bare block.