syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// new universe that extends `U` -- in this new universe, we can
context_before:     /// Once we "enter" into this `for<'a>` quantifier, we are in a
context_after:     /// name the region `'a`, but that region was not nameable from