{"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"if"}]}
        if let SelfSource::MethodCall(expr) = source {
        // give a helping note that it has to be called as `(x.f)(...)`.
            if !self.suggest_calling_field_as_fn(span, rcvr_ty, expr, item_ident, &mut err)