RBRACE
if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
else if (*pe == RBRACE) {
case RBRACE:
%token COMMA SEMICOLON LPAR RPAR LBRACE RBRACE LBRACKET RBRACKET DOT
| LBRACE statement_list RBRACE
statement_list RBRACE