Issue #13341 has been updated by Daniel Pittman.

This sounds great to me.  I can't see any reason why this wouldn't be 
desirable, provided we treat an empty nested exception slot sanely - since 
third party code can and should raise these.  We should consider inserting the 
minimal support - the accessor - into 2.7.x as well as Telly, so that code that 
sets the nested exception works across both platforms.  The actual printing 
changes might be more appropriate only in Telly.
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Refactor #13341: Add support for nested exceptions in Puppet::Error
https://projects.puppetlabs.com/issues/13341#change-58530

Author: Chris Price
Status: Needs Decision
Priority: High
Assignee: Daniel Pittman
Category: 
Target version: Telly
Affected Puppet version: 
Keywords: 
Branch: 


There are a decent number of places in the code where we catch an exception and 
then raise a Puppet::Error in response.  This can be a useful pattern when we 
have any extra information to add to the exception, but it comes at a painfully 
high price if we aren't careful not to lose the backtrace information from the 
original exception.

I would like to add an optional extra argument to the constructor for 
Puppet::Error that would allow you to pass in a nested exception, and then 
tweak the Logging#log_exception method to print the full series of backtraces 
when it is called with a Puppet::Error that takes advantage of this nesting.

Daniel, can you let me know if you have any concerns about this proposal?  If 
not I will probably tackle it relatively soon because I think it could be 
extremely helpful for debugging and troubleshooting.


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