[diekhans]

Thanks for the reply.

I try to use exception chaining to create a message that is useful for the user to actually debug the problem (solution-directed error message).

The classic toy case is either getting back "permission denied" or "can not open foo" but not both. Chaining of error messages gives a straightforward mechanism for this.

Then, the high-level text, along with the caused-by messages, is displayed without a stack trace to hopefully give the user enough information to address an issue.

Chaining can be done with explicitly returned errors as well as exceptions. The hard part is actually thinking about "is this use to the end user"