%token IDENTIFIER LBRACKET RBRACKET EOF

%%
call: expr expr EOF;

primary_expr
    : IDENTIFIER
    | LBRACKET expr RBRACKET
    ;

postfix_expr
    : primary_expr
    | postfix_expr LBRACKET RBRACKET
    | postfix_expr LBRACKET expr RBRACKET
    ;

expr
    : postfix_expr
    ;

%%