Coverage - Test going back when you can't.

tests/backfailmaze.log

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+## Try to go back in the maze, and fail
+n
+seed 1071883378
+in
+take lamp
+say xyzzy
+take rod
+e
+take cage
+w
+on
+w
+w
+drop rod
+take bird
+take rod
+w
+free bird
+wave rod
+drop rod
+take bird
+take jade
+e
+e
+e
+off
+xyzzy
+drop jade
+xyzzy
+on
+w
+w
+w
+take rod
+d
+w
+wave rod
+drop rod
+ew
+w
+w
+s
+s
+s
+n
+look
+w
+e
+e
+w
+n
+n
+sw
+up
+take axe
+e
+e
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+throw axe
+take axe
+w
+w
+w
+w
+throw axe
+take axe
+throw axe
+take axe
+throw axe
+take axe
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+w
+n
+s
+e
+w
+n
+s
+e
+back