[bug-gawk] : in debug mode, every eval causes double free of memory

[Jan Chaloupka]

Hi,

every time a gawk is started in debug mode, eval command is run 
correctly, but then double free of memory occurs. Occurs on Fedora 20.

Steps to reproduce:

1) gawk -f /tmp/emptygawk.awk --debug
2) type eval ""

/tmp/emptygawk.awk is empty file.

Reported in https://bugzilla.redhat.com/show_bug.cgi?id=1089073.

I've been able to trace the problem to debug.c:5567 and debug.c:5569. 
free_context frees memory. destroy_symbol then frees it for the second 
time. But why it is happening, it requires deeper knowledge of the 
source code.

Regards
Jan