shrdlu runs under clisp,
but under abcl 0.0.10.17 elements are undefined.

abcl:
Error loading blockp.lisp at line 770
The variable THNF is unbound



test version:
http://www.geocities.com/kimwroblewski/dashboard/shrdlu-src.tar.gz

original:
http://hci.stanford.edu/~winograd/shrdlu/download/consoleshrdlu.zip