Add new section on trait bounds.

exercises/04_traits/14_outro/Cargo.toml

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+[package]
+name = "outro_03"
+version = "0.1.0"
+edition = "2021"

exercises/04_traits/14_outro/src/lib.rs

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+// TODO: Define a new `SaturatingU16` type.
+//   It should hold a `u16` value.
+//   It should provide conversions from `u16`, `u8`, `&u16` and `&u8`.
+//   It should support addition with a right-hand side of type
+//   SaturatingU16, u16, &u16, and &SaturatingU16. Addition should saturate at the
+//   maximum value for `u16`.
+//   It should be possible to compare it with another `SaturatingU16` or a `u16`.
+//   It should be possible to print its debug representation.
+//
+// Tests are located in the `tests` folder—pay attention to the visibility of your types and methods.

exercises/04_traits/14_outro/tests/integration.rs

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+use outro_03::SaturatingU16;
+
+#[test]
+fn test_saturating_u16() {
+    let a: SaturatingU16 = (&10u8).into();
+    let b: SaturatingU16 = 5u8.into();
+    let c: SaturatingU16 = u16::MAX.into();
+    let d: SaturatingU16 = (&1u16).into();
+
+    assert_eq!(a + b, SaturatingU16::from(15u16));
+    assert_eq!(a + c, SaturatingU16::from(u16::MAX));
+    assert_eq!(a + d, SaturatingU16::from(11u16));
+    assert_eq!(a + a, 20u16);
+    assert_eq!(a + 5u16, 15u16);
+    assert_eq!(a + &u16::MAX, SaturatingU16::from(u16::MAX));
+}