syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"Some(LangItem::Sized)"}]}
source_snippet:             Some(LangItem::Sized) => SizedTraitKind::Sized,
context_before:         let sizedness = match tcx.as_lang_item(trait_pred.def_id()) {
context_after:             Some(LangItem::MetaSized) => SizedTraitKind::MetaSized,