Suggestion for better error messages

Once or day or so, I get an error like this in the apache logs of my Mason
site:

Execution of component 'foo' failed! - Couldn't rename
/foo/bar/3/6/c/36c102d368e368060e15dc23ef96ef83bb325582.tmp4153 to
/foo/bar/3/6/c/36c102d368e368060e15dc23ef96ef83bb325582 at
/usr/lib/perl5/site_perl/5.8.1/Cache/FileBackend.pm line 572.

Line 572 is:

  rename( $temp_path, _Untaint_Path( $p_path ) ) or
    throw Error::Simple( "Couldn't rename $temp_path to $p_path" );

It'd be nice if $! could be included in that error message somewhere since
I'm at a loss as to why I get about one of these rename() failure per day...

-John



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