        pub stack_trace: ::core::option::Option<StackTrace>,
    }
    /// Describes the current state of the execution. More states might be added
    /// in the future.
    #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, ::prost::Enumeration)]
    #[repr(i32)]
    pub enum State {
        /// Invalid state.
        Unspecified = 0,
        /// The execution is in progress.