feat: add traits5.rs exercise

exercises/traits/traits5.rs

@@ -0,0 +1,31 @@
+// traits5.rs
+//
+// Your task is to replace the '??' sections so the code compiles.
+// Don't change any line other than 27.
+
+// I AM NOT DONE
+
+pub trait SomeTrait {
+    fn some_function(&self) -> bool {
+        true
+    }
+}
+
+pub trait OtherTrait {
+    fn other_function(&self) -> bool {
+        true
+    }
+}
+
+struct SomeStruct {
+    name: String,
+}
+
+impl SomeTrait for SomeStruct {}
+impl OtherTrait for SomeStruct {}
+
+fn some_func(item: ??) -> bool {
+    item.some_function() && item.other_function()
+}
+
+fn main() {}

info.toml

@@ -727,6 +727,17 @@ Instead of using concrete types as parameters you can use traits. Try replacing
 See the documentation at: https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters
 """
 
+[[exercises]]
+name = "traits5"
+path = "exercises/traits/traits5.rs"
+mode = "compile"
+hint = """
+To ensure a paramter implements multiple traits use the '+ syntax'. Try replacing the
+'??' with 'impl <> + <>'.
+
+See the documentation at: https://doc.rust-lang.org/book/ch10-02-traits.html#specifying-multiple-trait-bounds-with-the--syntax
+"""
+
 # QUIZ 3
 
 [[exercises]]