{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"if"}]}
                if cx.tcx.is_diagnostic_item(sym::assume_init, def_id) {
                let def_id = cx.typeck_results().type_dependent_def_id(expr.hir_id)?;
                    // This is a call to *some* method named `assume_init`.