syntax_data: {"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let args = self.tcx.mk_args(&[new_pin_target.into()]);
context_before:                 let pin_did = self.tcx.require_lang_item(rustc_hir::LangItem::Pin, span);
context_after:                 let kind = ExprKind::Adt(Box::new(AdtExpr {