#7 Support nested exception in EvalError

open
nobody
None
5
2004-03-04
2004-03-04
No

In many cases EvalError is triggered by another exception.
It would make the debugging much easier if the EvalError
remembers the nested exception (as compared to just
remember the error string of the nested exception.)

The idea is very similar to the newly added Throwable
constructor in JDK1.4.

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