Try::tryGetExceptionObject
Summary: [Folly] `Try::tryGetExceptionObject`. If the `Try` has a `std::exception` for the non-template overload or a `From` where `is_convertible<From*, Ex*>` for the template overload parameterized by `typename Ex`, returns a pointer to it. Otherwise returns `nullptr`. Reviewed By: spacedentist Differential Revision: D5180848 fbshipit-source-id: b7593b7459259f9a1e1e78b36d548e55d086e722
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