PrivateResult: advice for functions returning object with
               non-public default constructor/assignment op.
============================================================
call result 3: 4711
* incrementing result id
call result 2: 4712
call result 1: 4712
call result 3: 4711
* incrementing result id
call result 2: 4712
call result 1: 4712
execution result 3: 4712
* incrementing result id
execution result 2: 4713
execution result 1: 4713
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problem with private inner types:
execution ("Safe::Inner Safe::uses_private_inner1()")
execution ("const Safe::Inner &Safe::uses_private_inner2()")
------------------------------------------------------------
return a union:
execution ("AUnion h()")
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