Errors not getting reported correctly

No matter what I do, I can't seem to coax Parse::RecDescent into reporting
errors from the right location in what I've reduced to the following code
snippet. I would expect for P::RD to report line 7 as an error in the
following example, but instead, it reports from line 2, near the start of
the parse tree, regardless of where I put the error. Any ideas?

===================================

#! /usr/local/bin/perl -w
use Parse::RecDescent;
use Data::Dumper;

my $parser = new Parse::RecDescent('

  <autotree>
  prog    : item eof
          | <error>
  item    : /\w+/ list(?)
  list    : "(" item(s) ")"
  eof     : /^\Z/

');
my $test = '
a(
  b
  c
  d(
    1
    2
    !!wrong!!
    4
   )
  e
 )
';

print Dumper $parser->prog($test);