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Author SHA1 Message Date
Zachary Turner a87d0ae61b Fix a bug in PythonExceptionState and add unittest coverage. 
I forgot to reset the restore flag when calling member function
`Acquire`.  The newly added unittest should cover this case.

llvm-svn: 253002
 2015-11-13 01:50:19 +00:00
Zachary Turner 3946247caf Introduce a `PythonExceptionState` class. 
This is a helper class which supports a number of
features including exception to string formatting with
backtrace handling and auto-restore of exception state
upon scope exit.

Additionally, unit tests are included to verify the
feature set of the class.

llvm-svn: 252994
 2015-11-13 01:24:52 +00:00