Hi, yylex() still gives the token ARITH_CMD for the following command. The error seems to be raised at the parsing stage. Shouldn't the error be caught in the lexical analysis stage?
$ ((x = 10 + 5; ++x; echo $x)) bash: ((: x = 10 + 5; ++x: syntax error: invalid arithmetic operator (error token is "; ++x") Why the parsing of the arithmetic expression is in the lexical analysis. Why not introduce token `((` and `))` and handle arithmetic expression in the bison parsing code? Also, I don't find that POSIX specifies `((`. (Let me know if I miss anything.) If `((` is a bash-specific thing, why not allow it to handle multiple arithmetic expressions instead of just one? Thanks. http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html -- Regards, Peng
