syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // they implement `Copy`. We could be smart here and short-circuit
context_before:             // All other types implement `BikeshedGuaranteedNoDrop` only if
context_after:             // some trivially `Copy`/`!Copy` types, but there's no benefit.