How to replace a (sub's) stub using PPI?

I'm playing with PPI and the problem of fleshing out a stub has me baffled. The following snippet illustrates my problem.

#!/usr/bin/env perl

use if (-d 'C:/Users/clueless_newbie'),lib=>'C:/Users/clueless_newbie/
+GOOGLE~1/code/lib';
use if (-d 'C:/Users/clueless_newbie'),lib=>'C:/Users/clueless_newbie/
+code/Perl-5/devlib';

# $ENV{DBG} -> compile time; $ENV{DEBUG} -> run time.
use if ($ENV{DBG} || $ENV{DEBUG}),"Devel::UnComment","#[=]#","Keep";

use Data::Dumper;
use PPI;
use PPI::Dumper;
use strict;
use warnings;
use 5.10.0;

{ # INTERNALS

    }; # INTERNALS

my $raw=<<'__RAW__';
   package FeeFi;
   sub Fee {
       print "Fee\n";
       }
   sub Fi {
       print "Fi\n";
       }
   -1;
__RAW__

my %sub_h;
{ # Save the subs; replacing them with placeholders
    # Create the PPI document
    my $document=PPI::Document->new(\$raw)
        or die "oops!";
    $document->save('before');

    for my $sub (@{$document->find('PPI::Statement::Sub') || []}) {
        unless ($sub->forward) {
            #say $sub->name;
            # save the sub and its content
            $sub_h{$sub->name}{content}=$sub->content;
            # Replace the sub's block as a stub by removing its childr
+en
            my @elements=$sub->block->children;
            for (my $i=0; $i < @elements; $i++) {
                $elements[$i]->remove;
                };
            };
        };
    # Save the stubbed out "main/package" under the key '';
    $sub_h{''}{content}=$document->content;
    };
#=# DEBUG [ sub_h=>\%sub_h ];

# Completing the round trip
{
    # Create the stubbed out main
    my $document=PPI::Document->new(\$sub_h{''}{content})
        or die "oops creating ''!";
    #=# DEBUG '',PPI::Dumper->new($document,whitespace=>0)->string;

    # Find and flesh out the stubs
    for my $stub (@{$document->find('PPI::Statement::Sub') || []}) {
          unless ($stub->forward) {
            my $name=$stub->name;
            #=# TRACE $name;
            # Flesh out this stub
            my $sub=PPI::Document->new(\$sub_h{$name}{content})->find_
+first('PPI::Statement::Sub');
            #=# TRACE '',PPI::Dumper->new($sub,whitespace=>0)->string;

            # So ow do I flesh out the stub from $sub????
            $stub->insert_after($sub)    # <=== Doesn't do it!
                or warn "Can't insert_after!";
            #=# DEBUG '',PPI::Dumper->new($document,whitespace=>0)->st
+ring;


              };
        };
    #=# DEBUG '',PPI::Dumper->new($document,whitespace=>0)->string;
    $document->save('after');            # <=== "after" should be prog
+rammatically equal to "before"
    };

exit;
[download]

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