[9front] Bug in rc

[Yury Chumak <sfynkx@gmail.com>]

Hello all..

Noticed that rc returns error 'stack overflow' if code consists
'switch' construction with big amount of 'case' blocks. Steps to
reproduce:

1.Generate test script by next code:
#!/bin/rc
echo '#!/bin/rc' >test.rc
echo 'switch($*){' >>test.rc
for(i in `{seq 1 250}){
    echo ' case ' $i>>test.rc
    echo '    echo number ' $i>>test.rc
}
echo ' case *' >>test.rc
echo '    echo number none'>>test.rc
echo '}'>>test.rc

2. Run result script:
% chmod +x test.rc
% test.rc
./test.rc:497: token 248: yacc stack overflow

The 'switch' construction works normaly with number 'case' block less than 247.
In comparison linux's bash has no limitation to number elements in
'case' block (at least 500k tested).


-- 
Sphynkx