Puppet users - Apr 2013 - How to get return code of a command used in a custom provider.

When using optional_commands in a custom provider is there a means to get 
the return code of the execution?  Something similar to "echo $?" on
Linux.

For example, if I define foo

optional_commands :foo => ''foo''

I want to execute foo() and test if it was successful or not with in some 
conditional logic.

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