From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225

Description of problem:
The patch at the above URL from the gawk maintainer is needed so that
uninitialized variables passed to functions and used in a scalar context do not
generate an internal error.  Without the patch, the following fails:

function f(x) { return x }

BEGIN {
   f(z) 
   f(z) # this second invocation generates an internal error
   exit 0
}


Version-Release number of selected component (if applicable):
gawk-3.1.3-1

How reproducible:
Always

Steps to Reproduce:
1. Test code in bug.gawk
2. gawk -f bug.gawk

Actual Results:  $ gawk -f bug.gawk
gawk: bug.gawk:5: fatal error: internal error
Aborted

Expected Results:  Exits silently.

Additional info:

gawk-3.1.3 has many additional changes to io.c.  There were numerous I/O
problems in 3.1.2 related to the I/O rewrite, which seem to have been resolved,
but there may be dragons.