OP1
$$ = OP1(DT_TOK_POSTINC, $1);
$$ = OP1(DT_TOK_POSTDEC, $1);
| DT_TOK_ADDADD unary_expression { $$ = OP1(DT_TOK_PREINC, $2); }
| DT_TOK_SUBSUB unary_expression { $$ = OP1(DT_TOK_PREDEC, $2); }
| unary_operator cast_expression { $$ = OP1($1, $2); }
| DT_TOK_SIZEOF unary_expression { $$ = OP1(DT_TOK_SIZEOF, $2); }
$$ = OP1(DT_TOK_SIZEOF, dt_node_type($3));
$$ = OP1(DT_TOK_STRINGOF, $2);