'eval' exit behaviour in posix mode

[Martijn Dekker]

In current git, 'bash -o posix' no longer exits the shell on a syntax 
error in the argument to the special builtin 'eval'. Bash 4.2-4.4 exit 
as POSIX specifies.

$ bash -o posix -c 'eval "(" || echo woops'
bash: eval: regel 1: syntaxfout: onverwacht bestandseinde
woops
On the other hand, note that 'command eval' should *not* exit. Bash 
4.2-4.4 exit on 'command eval "("' which is also a bug.

Thanks,

- M.