syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"self.tcx().require_lang_item(LangItem::Sized,"}]}
source_snippet:                 self.tcx().require_lang_item(LangItem::Sized, cause.span),
context_before:                 self.tcx(),
context_after:                 [subty],