syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// is `{Send, Sync}`, while there is no principal. These trait objects
context_before:     /// `dyn Send + Sync`. In that case, the set of auto-trait bounds
context_after:     /// have a "trivial" vtable consisting of just the size, alignment,