3 files changed, 12 insertions, 0 deletions
diff --git a/exercises/07_structs/structs1.rs b/exercises/07_structs/structs1.rs
index 2978121..cd8b81c 100644
--- a/exercises/07_structs/structs1.rs
+++ b/exercises/07_structs/structs1.rs
@@ -14,6 +14,10 @@ struct ColorTupleStruct(/* TODO: Something goes here */);
 #[derive(Debug)]
 struct UnitLikeStruct;
 
+fn main() {
+    // You can optionally experiment here.
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/exercises/07_structs/structs2.rs b/exercises/07_structs/structs2.rs
index a7a2dec..7e61e75 100644
--- a/exercises/07_structs/structs2.rs
+++ b/exercises/07_structs/structs2.rs
@@ -28,6 +28,10 @@ fn create_order_template() -> Order {
     }
 }
 
+fn main() {
+    // You can optionally experiment here.
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/exercises/07_structs/structs3.rs b/exercises/07_structs/structs3.rs
index 9835b81..bd562a1 100644
--- a/exercises/07_structs/structs3.rs
+++ b/exercises/07_structs/structs3.rs
@@ -38,6 +38,10 @@ impl Package {
     }
 }
 
+fn main() {
+    // You can optionally experiment here.
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;