syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// presence of `for<..>` binders to control what sets of names are
context_before:     /// "Universes" are used during type- and trait-checking in the
context_after:     /// visible. Universes are arranged into a tree: the root universe