{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
                    // binding already exists in this set, it should not result in an error because
                    // Add a new set of bindings to the stack. `Or` here records that when a
                    // `V1(a) | V2(a)` must be allowed and are checked for consistency later.