traits5 solution

exercises/15_traits/traits5.rs

@@ -1,7 +1,3 @@
-// Your task is to replace the '??' sections so the code compiles.
-//
-// Don't change any line other than the marked one.
-
 trait SomeTrait {
     fn some_function(&self) -> bool {
         true
@@ -14,20 +10,30 @@ trait OtherTrait {
     }
 }
 
-struct SomeStruct {}
+struct SomeStruct;
-struct OtherStruct {}
-
 impl SomeTrait for SomeStruct {}
 impl OtherTrait for SomeStruct {}
+
+struct OtherStruct;
 impl SomeTrait for OtherStruct {}
 impl OtherTrait for OtherStruct {}
 
-// YOU MAY ONLY CHANGE THE NEXT LINE
+// TODO: Fix the compiler error by only changing the signature of this function.
-fn some_func(item: ??) -> bool {
+fn some_func(item: ???) -> bool {
     item.some_function() && item.other_function()
 }
 
 fn main() {
-    some_func(SomeStruct {});
+    // You can optionally experiment here.
-    some_func(OtherStruct {});
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_some_func() {
+        assert!(some_func(SomeStruct));
+        assert!(some_func(OtherStruct));
+    }
 }

rustlings-macros/info.toml

@@ -792,12 +792,12 @@ https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters"""
 [[exercises]]
 name = "traits5"
 dir = "15_traits"
-test = false
 hint = """
 To ensure a parameter implements multiple traits use the '+ syntax'. Try
-replacing the '??' with 'impl [what goes here?] + [what goes here?]'.
+replacing `???` with 'impl [what goes here?] + [what goes here?]'.
 
-See the documentation at: https://doc.rust-lang.org/book/ch10-02-traits.html#specifying-multiple-trait-bounds-with-the--syntax"""
+Related section in The Book:
+https://doc.rust-lang.org/book/ch10-02-traits.html#specifying-multiple-trait-bounds-with-the--syntax"""
 
 # QUIZ 3
 

solutions/15_traits/traits5.rs

@@ -1 +1,39 @@
-// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
+trait SomeTrait {
+    fn some_function(&self) -> bool {
+        true
+    }
+}
+
+trait OtherTrait {
+    fn other_function(&self) -> bool {
+        true
+    }
+}
+
+struct SomeStruct;
+impl SomeTrait for SomeStruct {}
+impl OtherTrait for SomeStruct {}
+
+struct OtherStruct;
+impl SomeTrait for OtherStruct {}
+impl OtherTrait for OtherStruct {}
+
+fn some_func(item: impl SomeTrait + OtherTrait) -> bool {
+    //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+    item.some_function() && item.other_function()
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_some_func() {
+        assert!(some_func(SomeStruct));
+        assert!(some_func(OtherStruct));
+    }
+}