syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// consists only of auto traits, with no principal - for example,
context_before:     /// It is also possible to have a "trivial" trait object that
context_after:     /// `dyn Send + Sync`. In that case, the set of auto-trait bounds