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NodeTypes

 Property

Summary

The node types the rule can fire on — usually one, occasionally two, and empty where
the pattern's shape does not say.

Remarks

A necessary condition, not a sufficient one: a node of one of these types may
still fail the rest of the pattern. That is the direction that makes it useful, since
what it licenses is skipping the rule on every other type — which is the dispatch a
large switch over distinct node types gets from the compiler for free and a
list of rules has to be told.

























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