message: tste(api) Test the `IntoResult` trait.
diff: @@ -692,6 +692,50 @@ mod inner {
  }
  }
  + #[cfg(test)]
  + mod test_into_result {
  + use super::*;
  + use std::convert::Infallible;
  +
  + #[test]
  + fn test_into_result_over_t() {
  + let x: i32 = 42;
  + let result_of_x: Result<i32, Infallible> = x.into_result();
  +
  + assert_eq!(result_of_x.unwrap(), x);
  + }
  +
  + #[test]
  + fn test_into_result_over_result() {
  + {
  + let x: Result<i32, Infallible> = Ok(42);
  + let result_of_x: Result<i32, Infallible> = x.into_result();
  +
  + assert_eq!(result_of_x, x);
  + }
  +
  + {
  + use std::{error, fmt};
  +
  + #[derive(Debug, PartialEq)]
  + struct E;
  +
  + impl fmt::Display for E {
  + fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
  + write!(formatter, "E")
  + }
  + }
  +
  + impl error::Error for E {}
  +
  + let x: Result<Infallible, E> = Err(E);
  + let result_of_x: Result<Infallible, E> = x.into_result();
  +
  + assert_eq!(result_of_x.unwrap_err(), E);
  + }
  + }
  + }
  +
  /// The `HostFunction` trait represents the set of functions that
  /// can be used as host function. To uphold this statement, it is
  /// necessary for a function to be transformed into a pointer to
  