package junk;
use Attribute::Handlers;
no warnings 'redefine';

sub TRACE : ATTR(CODE,BEGIN) {
    my ($pkg, $sym, $ref, $attr, $data, $phase, $file, $line) = @_;
    *{ $sym } = sub {
        warn "$file($line) called with [@_]\n";
        my( @rc )= &$ref;
        warn "$file($line): returning [ @rc ]\n";
    }
}

sub doStuff :TRACE {
    print "junk::doStuff says hi";
}
1;