I think negative level is wrongly defined. (u L:(-r) y) applies u at
level ((L. y) -r), which measures from the bottom of the tree. What I
want is a form that applies u two levels down, say, which I can't get
now. I propose to change L: to do what I want.
Has anyone found a use for L:(-r) using the current definition?
My proposed change is described at
https://code.jsoftware.com/wiki/System/Interpreter/Requests#Change_definition_of_negative_level_.28strawman.29
Henry Rich
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