In Spreadsheet::Read Win32::LongPath::openL, I wrote something like:

my $tmp = File::Temp-> new( SUFFIX => '.ods' )-> filename;
copyL 'whatever.ods', $tmp; 
say 'ok' if defined ReadData( $tmp );
[download]

which I later realized didn't work exactly as intended. Temp file (and object) no longer existed after 1st statement, copyL simply "hijacked" file name, and temp file wasn't cleaned-up at program end.

Initially I wanted it shorter as

copyL 'whatever.ods', my $tmp = File::Temp-> new( SUFFIX => '.ods' )->
+ filename;
say 'ok' if defined ReadData( $tmp );
[download]

it wasn't "ok" for reason stated above. Instead, in retrospect, this would work:

copyL 'whatever.ods', my $tmp = File::Temp-> new( SUFFIX => '.ods' );
say 'ok' if defined ReadData( $tmp-> filename );
[download]

Then object stringifies itself in 1st statement, and survives because bound to a variable. From practical point, that's about it all. However, during investigation I was puzzled by unexpected (though maybe not practically useful) behaviour:

use 5.014;
use warnings;

package Temp;
use parent 'File::Temp';

sub new { 
    my $self = shift;
    $self-> SUPER::new( DIR => '.' )
}

sub DESTROY {
    my $self = shift;
    say 'global' if ${^GLOBAL_PHASE} eq 'DESTRUCT';
    $self-> SUPER::DESTROY
}

package main;
use File::Copy;

sub foo { my $h = Temp-> new }

die unless -f 'x';      # this file must exist

copy 'x', my $fn1 = Temp-> new-> filename                or die;
copy 'x', my $fn2 = do { Temp-> new }-> filename         or die;
copy 'x', my $fn3 = do { my $h = Temp-> new }-> filename or die;
copy 'x', my $fn4 = foo-> filename                       or die;

say 1 if -f $fn1;
say 2 if -f $fn2;
say 3 if -f $fn3;
say 4 if -f $fn4;
[download]

which says "3". All copying completes successfully, and I'd expect objects destroyed and temp files deleted by end of each of 4 statements. But, somehow, object survives if bound to lexical variable in "do" block, but not in case of subroutine call. Why?

Auxiliary question: object was not destroyed during global destruction at program end, but when?

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