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

Main( @ARGV );
exit( 0 );

{
    use constant +{ qw{ TYPE 0 NAME 1 ACTION 2 } };
## to undefine globals TYPE/NAME/ACTION outside of this block
    use namespace::clean;
    format OFG =
    @<<<<<<<<         @<<<<<<<<<<<<<<<<<<<<   @<<<<<<
    $_[TYPE],            $_[NAME],                  $_[ACTION]
.
}

format THREECHARFORMAT =
^<<~~
$_[0]
.

sub fwThree {
    return formatWrite( *STDOUT, "::THREECHARFORMAT", @_ );
}
sub formatWrite {
    use IO::Handle;
    my $handle = shift;
    my $format = shift;
    local @_ = @_;
    $handle->format_name( $format );
    write $handle;
}
sub Main {
    fwThree("foobar");
    formatWrite( *STDOUT, "::OFG", qw/ TYPE NAME ACTION / );
    formatWrite( *STDERR, "::OFG", TYPE(), NAME(), ACTION() );
}
__END__
$ perl format.fill.overflow.11113982.pl
foo
bar
    TYPE              NAME                    ACTION
Undefined subroutine &main::TYPE called at format.fill.overflow.11113982.pl line 56.