diff --git a/exercises/06_ticket_management/08_impl_trait/src/lib.rs b/exercises/06_ticket_management/08_impl_trait/src/lib.rs
index d8afbe0..b247a72 100644
--- a/exercises/06_ticket_management/08_impl_trait/src/lib.rs
+++ b/exercises/06_ticket_management/08_impl_trait/src/lib.rs
@@ -7,6 +7,14 @@ pub struct TicketStore {
     tickets: Vec<Ticket>,
 }
 
+impl TicketStore {
+    fn in_progress(&self) -> impl Iterator<Item = &Ticket> {
+        self.tickets
+            .iter()
+            .filter(|&a| a.status == Status::InProgress)
+    }
+}
+
 #[derive(Clone, Debug, PartialEq)]
 pub struct Ticket {
     pub title: TicketTitle,
diff --git a/exercises/06_ticket_management/09_impl_trait_2/src/lib.rs b/exercises/06_ticket_management/09_impl_trait_2/src/lib.rs
index 33e982b..fa3e99c 100644
--- a/exercises/06_ticket_management/09_impl_trait_2/src/lib.rs
+++ b/exercises/06_ticket_management/09_impl_trait_2/src/lib.rs
@@ -33,7 +33,10 @@ impl TicketStore {
     // that can be infallibly converted into a `Ticket`.
     // This can make it nicer to use the method, as it removes the syntax noise of `.into()`
     // from the calling site. It can worsen the quality of the compiler error messages, though.
-    pub fn add_ticket(&mut self, ticket: impl Into<Ticket>) {
+    pub fn add_ticket<T>(&mut self, ticket: T)
+    where
+        T: Into<Ticket>,
+    {
         self.tickets.push(ticket.into());
     }
 }
diff --git a/exercises/06_ticket_management/10_slices/src/lib.rs b/exercises/06_ticket_management/10_slices/src/lib.rs
index 1d2c6f7..b3ad556 100644
--- a/exercises/06_ticket_management/10_slices/src/lib.rs
+++ b/exercises/06_ticket_management/10_slices/src/lib.rs
@@ -1,6 +1,9 @@
 // TODO: Define a function named `sum` that takes a reference to a slice of `u32` and returns the sum of all
 //  elements in the slice.
 
+fn sum(v: &[u32]) -> u32 {
+    v.iter().sum()
+}
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/exercises/06_ticket_management/11_mutable_slices/src/lib.rs b/exercises/06_ticket_management/11_mutable_slices/src/lib.rs
index 4ba888c..b3e338c 100644
--- a/exercises/06_ticket_management/11_mutable_slices/src/lib.rs
+++ b/exercises/06_ticket_management/11_mutable_slices/src/lib.rs
@@ -1,6 +1,14 @@
 // TODO: Define a function named `squared` that raises all `i32`s within a slice to the power of 2.
 //  The slice should be modified in place.
 
+fn squared(v: &mut [i32]) {
+    for val in v.iter_mut() {
+        *val = val.pow(2);
+    }
+    // let b = v.iter().map(|a| a.pow(2)).collect::<Vec<_>>().as_slice();
+    // v = b;
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;