Crash on out of range row index

% view a def {1 2 3 4} | get 10 a

Crash.

Not sure if this is part of a different case or not:

 % view a def {1 2 3 4} | get 2 a 3 b

Crash.

Summary

Thanks. I've added some more checks and a few cases in error.test to better guard against out of bounds row or column access. Note that row -1 is valid (its the last row), and so is column -1, but -10 and 10 are clearly not. Changes now in darcs.