Is this a simple case of me not knowing about a write output or seriously overlooking something blatant?

I was reading that use re 'debug'; is lexically scoped, but after redirecting both STDERR and STDOUT to a file, I still get output to on my console. The scope works properly (as I don't see output for the latter regex check on either STD* outputs or files), but why is there output from re 'debug' showing up on my console even with the redirects?

What output is the debug command outputting to that I don't know about?

#!/usr/bin/perl
use warnings;
use strict;

my $string = 'd"alice';

{
    use re 'debug';

    open STDERR, '>', 'err.txt' or die $!;
    open STDOUT, '>', 'out.txt' or die $!;

    $string =~ s/\bd\"//g;
}

$string =~ /alice/;

[download]

Output to the console from the code above:

$ ./bound.pl 
Compiling REx "\bd\%""
Final program:
   1: BOUND (2)
   2: EXACT <d"> (4)
   4: END (0)
anchored "d%"" at 0 (checking anchored) stclass BOUND minlen 2

[download]

Full output without redirects or scoping the use statement:

Compiling REx "\bd\%""
Final program:
   1: BOUND (2)
   2: EXACT <d"> (4)
   4: END (0)
anchored "d%"" at 0 (checking anchored) stclass BOUND minlen 2 
Matching REx "\bd\%"" against "d%"alice"
Intuit: trying to determine minimum start position...
  doing 'check' fbm scan, [0..7] gave 0
  Found anchored substr "d%"" at offset 0 (rx_origin now 0)...
  (multiline anchor test skipped)
  looking for class: start_shift: 0 check_at: 0 rx_origin: 0 endpos: 1
  Does not contradict STCLASS...
Intuit: Successfully guessed: match at offset 0
   0 <> <d"alice>            |  1:BOUND(2)
   0 <> <d"alice>            |  2:EXACT <d">(4)
   2 <d"> <alice>            |  4:END(0)
Match successful!
Matching REx "\bd\%"" against "alice"
Intuit: trying to determine minimum start position...
  doing 'check' fbm scan, [2..7] gave -1
  Did not find anchored substr "d%""...
Match rejected by optimizer
Freeing REx: "\bd\%""

[download]

Why is the beginning part of the output being written to the console, and the rest stored in my redirected err.txt file?

On v5.22.0 fwiw

-stevieb

In reply to use re 'debug';, scope, and output by stevieb

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