On Jul 6, 2014 8:15 AM, "Yuras Shumovich"
Hello,
From docs: "If an exception is raised, then bracket will re-raise the exception (after performing the release)."
But what if the release action will throw an exception? There are 3 options: 1) suppress the exception from release action and rethrow the original one 2) shutdown the program 3) suppress the original exception and throw the exception from release action.
Current behavior is #3 -- suppress the original exception. I think it the worse choice.
What other languages do:
- java has try-with-resources statement which is the nearest equivalent of haskell's "bracket". It uses the option #1 (rethrow the original exception)
- in c++ it is common to use RAII for resource management, so someone's destructor performs resource cleanup. But if destructor throws exception during stack unrolling, the program is terminated (option #2)
You left off what I think is the best behavior, from Python 3: 4) Throw the exception for the release action, chaining the original exception to it. The default exception handler reports the them both.
I prefer #2 because suppressing exception is a really bad idea. What is your choice?
#4.