Commits on Mar 18, 2020

1. Allow catch behavior to be customized …

   If the user's cxx::bridge invocation includes any header that defines
   the following function, they get it's behavior as the exception-to-Result
   conversion.
   
       namespace rust::behavior {
       template <typename Try, typename Fail>
       static void trycatch(Try &&func, Fail &&fail) noexcept try {
         func();
       } catch (/* up to you */) {
         fail(/* const char *msg */);
       }
       }
   
   The default behavior is equivalent to:
   
       } catch (const std::exception &e) {
         fail(e.what());
       }
   
   Codebases that use Folly, for example, may be interested in behavior
   like this instead for better type information on the error messages:
   
       } catch (const std::exception &e) {
         fail(folly::exceptionStr(e));
       } catch (...) {
         fail("<unknown exception>");
       }

   

   dtolnay committed Mar 18, 2020
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2. Make trycatch sfinae work on msvc

   

   dtolnay committed Mar 18, 2020
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