syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"tcx.require_lang_item(hir::LangItem::Sized,"}]}
source_snippet:             tcx.require_lang_item(hir::LangItem::Sized, field_ty.source_info.span),
context_before:             field_ty.ty,
context_after:         );