syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"SizedTraitKind::MetaSized"}]}
source_snippet:                 SizedTraitKind::MetaSized => ty::Binder::dummy(vec![]),
context_before:                 SizedTraitKind::Sized => unreachable!("tried to assemble `Sized` for unsized type"),
context_after:             },