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signMemo

 Field

Summary

The signs already established, keyed by the destination they were established against
as well as by the expression, and shared by every approach inside the outermost one.

Remarks

A memo per approach is very nearly no memo at all: the limit machinery re-enters
itself constantly and asks about the same operands each time -- one computation put
the same pair to the rule 192 times, and each answer costs two limits, which run this
whole machinery. It is dropped when the outermost approach is left, so nothing
survives a call.

























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