gawk core dumps

[Lambert, David W (S&T)]

In [a shell buffer of] GNU Emacs 20.7.1 (alphaev6-dec-osf5.1, X toolkit)
 of Mon Sep 24 2001 on faster.corning.com

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

$ gawk 'a[]'
gawk: cmd. line:1: a[]
gawk: cmd. line:1:   ^ parse error
gawk: cmd. line:1: fatal error: internal error
zsh: abort (core dumped)  gawk a[]


Thanks