trap works funny

this is an (edited for clarity) excerpt from a program i running. i
expected it to liaf to the next file on both traps, and it does on the
first one. however, the program simply stops without any explanation
on the last trap.

{
    match  <fromend> (:: :filename:) [:files:] /(^.*?\.dag)\n/
    output /:*:filename:\n/
    call /:read-file:/ [:*:filename:]
    liaf
}

:read-file: (:name:)
{
    {
	input (:ffile:) [:*:name:]
	trap /unable to read-open the file/
	output /Couldn't read file! Trying next file.\n/
	return
	
	trap /program has overflowed/ #the file is too big for the machine's memory
	output /File too big!\n/
	return
    }
    #doing stuff here if the file exists and is not too big
}


this is the output of running it when 'files' is a list that begins
with a nonexistent file, and the second one is too huge:

nonexistant-file.dag
Couldn't read file! Trying next file.
/prosjekt/aviskorpus/ap/dag/2007/20071120.dag

note the missing 'File too big' output

------------------------------------------------------------------------------
Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com