noun: properly type tree addressing functions #4
+7
−7
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The fragmenter() should produce a function that takes and produces a Noun. The at() functions should produce a Noun, because they call a function produced by the fragmenter().
(Having .at() on Atoms is a little bit weird, but lets you call it on opaque Nouns. It'll crash in the same way that it would crash on shallow Cells or other "miss" cases.)