need to read ownership stuff now.. stack heap inbound

exercises/06_move_semantics/move_semantics1.rs

@@ -1,6 +1,6 @@
 // TODO: Fix the compiler error in this function.
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    let vec = vec;
+    let mut vec = vec;
 
     vec.push(88);
 
@@ -8,7 +8,9 @@ fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
 }
 
 fn main() {
-    // You can optionally experiment here.
+    let vec0 = vec![22, 44, 66];
+    let vec1 = fill_vec(vec0);
+    println!("{:?}", vec1);
 }
 
 #[cfg(test)]

exercises/06_move_semantics/move_semantics2.rs

@@ -7,7 +7,9 @@ fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
 }
 
 fn main() {
-    // You can optionally experiment here.
+    let vec0 = vec![22, 44, 66];
+    let vec1 = fill_vec(vec0);
+    println!("{:?}", vec1);
 }
 
 #[cfg(test)]

exercises/06_move_semantics/move_semantics3.rs

@@ -6,7 +6,9 @@ fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
 }
 
 fn main() {
-    // You can optionally experiment here.
+    let vec0 = vec![22, 44, 66];
+    let vec1 = fill_vec(vec0);
+    println!("{:?}", vec1);
 }
 
 #[cfg(test)]

solutions/06_move_semantics/move_semantics1.rs

@@ -1,4 +1,25 @@
-fn main() {
-    // DON'T EDIT THIS SOLUTION FILE!
-    // It will be automatically filled after you finish the exercise.
+fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+    let mut vec = vec;
+    //  ^^^ added
+
+    vec.push(88);
+
+    vec
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn move_semantics1() {
+        let vec0 = vec![22, 44, 66];
+        let vec1 = fill_vec(vec0);
+        // `vec0` can't be accessed anymore because it is moved to `fill_vec`.
+        assert_eq!(vec1, vec![22, 44, 66, 88]);
+    }
 }