diff --git a/exercises/iterators/iterators1.rs b/exercises/iterators/iterators1.rs
index b3f698b..31076bb 100644
--- a/exercises/iterators/iterators1.rs
+++ b/exercises/iterators/iterators1.rs
@@ -11,6 +11,7 @@
 
 // I AM NOT DONE
 
+#[test]
 fn main() {
     let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
 
diff --git a/exercises/move_semantics/move_semantics3.rs b/exercises/move_semantics/move_semantics3.rs
index 69e564a..7af9e69 100644
--- a/exercises/move_semantics/move_semantics3.rs
+++ b/exercises/move_semantics/move_semantics3.rs
@@ -1,6 +1,6 @@
 // move_semantics3.rs
 //
-// Make me compile without adding new lines-- just changing existing lines! (no
+// Make me compile without adding new lines -- just changing existing lines! (no
 // lines with multiple semicolons necessary!)
 //
 // Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand
diff --git a/exercises/move_semantics/move_semantics5.rs b/exercises/move_semantics/move_semantics5.rs
index 68db09e..267bdcc 100644
--- a/exercises/move_semantics/move_semantics5.rs
+++ b/exercises/move_semantics/move_semantics5.rs
@@ -8,6 +8,7 @@
 
 // I AM NOT DONE
 
+#[test]
 fn main() {
     let mut x = 100;
     let y = &mut x;
diff --git a/exercises/smart_pointers/rc1.rs b/exercises/smart_pointers/rc1.rs
index ad3f1ce..1b90346 100644
--- a/exercises/smart_pointers/rc1.rs
+++ b/exercises/smart_pointers/rc1.rs
@@ -35,6 +35,7 @@ impl Planet {
     }
 }
 
+#[test]
 fn main() {
     let sun = Rc::new(Sun {});
     println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
diff --git a/exercises/threads/threads3.rs b/exercises/threads/threads3.rs
index db7d41b..91006bb 100644
--- a/exercises/threads/threads3.rs
+++ b/exercises/threads/threads3.rs
@@ -48,6 +48,7 @@ fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
     });
 }
 
+#[test]
 fn main() {
     let (tx, rx) = mpsc::channel();
     let queue = Queue::new();
diff --git a/info.toml b/info.toml
index c84dfa5..9930917 100644
--- a/info.toml
+++ b/info.toml
@@ -337,7 +337,7 @@ So the end goal is to:
 [[exercises]]
 name = "move_semantics5"
 path = "exercises/move_semantics/move_semantics5.rs"
-mode = "compile"
+mode = "test"
 hint = """
 Carefully reason about the range in which each mutable reference is in
 scope. Does it help to update the value of referent (x) immediately after
@@ -827,7 +827,7 @@ https://doc.rust-lang.org/stable/book/ch11-01-writing-tests.html#checking-for-pa
 [[exercises]]
 name = "iterators1"
 path = "exercises/iterators/iterators1.rs"
-mode = "compile"
+mode = "test"
 hint = """
 Step 1:
 We need to apply something to the collection `my_fav_fruits` before we start to go through
@@ -932,7 +932,7 @@ and try other types!
 [[exercises]]
 name = "rc1"
 path = "exercises/smart_pointers/rc1.rs"
-mode = "compile"
+mode = "test"
 hint = """
 This is a straightforward exercise to use the Rc<T> type. Each Planet has
 ownership of the Sun, and uses Rc::clone() to increment the reference count of the Sun.
@@ -1021,7 +1021,7 @@ what you've learned :)"""
 [[exercises]]
 name = "threads3"
 path = "exercises/threads/threads3.rs"
-mode = "compile"
+mode = "test"
 hint = """
 An alternate way to handle concurrency between threads is to use
 a mpsc (multiple producer, single consumer) channel to communicate.