message: Change `thrust::system_error` in the CUDA backend to print out its `cudaError_t`
  enumerator in addition to the diagnostic message.
  Bug
  Bug
diff: @@ -59,9 +59,12 @@ class cuda_error_category
  inline virtual std::string message(int ev) const
  {
  - static const std::string unknown_err("Unknown error");
  - const char *c_str = ::cudaGetErrorString(static_cast<cudaError_t>(ev));
  - return c_str ? std::string(c_str) : unknown_err;
  + char const* const unknown_str = "unknown error";
  + char const* const unknown_name = "cudaErrorUnknown";
  + char const* c_str = ::cudaGetErrorString(static_cast<cudaError_t>(ev));
  + char const* c_name = ::cudaGetErrorName(static_cast<cudaError_t>(ev));
  + return std::string(c_name ? c_name : unknown_name)
  + + ": " + (c_str ? c_str : unknown_str);
  }
  inline virtual error_condition default_error_condition(int ev) const
  