[rules-dev] modify( expr ) {....}

[Wolfgang Laun]

The main point I was trying to make here was that very complex expressions
are very, very rare.

An acceptable compromise would be to analyse what can be done without
busting a vein, and to flag anything anthing else as an error ("expression
too complicated") and document the way around, presumably a user-defined
variable where the user provides the type. And if the expressions is really
so complex, this might even imrove readability ;-)

Wolfgang
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