{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
            let ty = self.check_expr_with_hint(field.expr, field_type);
            // an error, so we can continue type-checking.
            let diag = self.demand_coerce_diag(field.expr, ty, field_type, None, AllowTwoPhase::No);