{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"if"}]}
                if let hir::ExprKind::Call(path, [arg]) = ex.kind
                // corresponding to the desugaring of a for loop `for <pat> in <head> { <body> }`.
                    && let hir::ExprKind::Path(hir::QPath::LangItem(LangItem::IntoIterIntoIter, _)) =