OK, but do I have to run the overwritten method explicitly? It seems to do nothing:

use 5.006;
use strict;
use warnings;
use ExtUtils::MakeMaker;

my %WriteMakefileArgs = (
    NAME             => 'A::B',
    AUTHOR           => q{ah <abc@abc.abc>},
    VERSION_FROM     => 'lib/A/B.pm',
    ABSTRACT_FROM    => 'lib/A/B.pm',
    LICENSE          => 'artistic_2',
    MIN_PERL_VERSION => '5.006',
    CONFIGURE_REQUIRES => {
        'ExtUtils::MakeMaker' => '0',
    },
    TEST_REQUIRES => {
        'Test::More' => '0',
    },
    PREREQ_PM => {
        #'ABC'              => '1.6',
        #'Foo::Bar::Module' => '5.0401',
    },
    dist  => { COMPRESS => 'gzip -9f', SUFFIX => 'gz', },
    clean => { FILES => 'A-B-*' },
);

# Compatibility with old versions of ExtUtils::MakeMaker
unless (eval { ExtUtils::MakeMaker->VERSION('6.64'); 1 }) {
    my $test_requires = delete $WriteMakefileArgs{TEST_REQUIRES} || {}
+;
    @{$WriteMakefileArgs{PREREQ_PM}}{keys %$test_requires} = values %$
+test_requires;
}

unless (eval { ExtUtils::MakeMaker->VERSION('6.55_03'); 1 }) {
    my $build_requires = delete $WriteMakefileArgs{BUILD_REQUIRES} || 
+{};
    @{$WriteMakefileArgs{PREREQ_PM}}{keys %$build_requires} = values %
+$build_requires;
}

delete $WriteMakefileArgs{CONFIGURE_REQUIRES}
    unless eval { ExtUtils::MakeMaker->VERSION('6.52'); 1 };
delete $WriteMakefileArgs{MIN_PERL_VERSION}
    unless eval { ExtUtils::MakeMaker->VERSION('6.48'); 1 };
delete $WriteMakefileArgs{LICENSE}
    unless eval { ExtUtils::MakeMaker->VERSION('6.31'); 1 };

WriteMakefile(%WriteMakefileArgs);

sub MY::all_target {
    my $self = shift;
die 123;
    return <<'MAKE_EXT';
all :: pure_all translations manifypods
        $(NOECHO) $(NOOP)
MAKE_EXT
}
[download]

Also, no change if placed before WriteMakefile()

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