syntax_data: {"ast_node_type":"other","tokens":[{"end":28,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // Never `Sized`
context_before:         ty::Str | ty::Slice(..) | ty::Dynamic(_, _, ty::Dyn) => match sizedness {
context_after:             SizedTraitKind::Sized => Some(ty),