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-rw-r--r--exercises/23_conversions/as_ref_mut.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/exercises/23_conversions/as_ref_mut.rs b/exercises/23_conversions/as_ref_mut.rs
index cd2c93b..6fb7c2f 100644
--- a/exercises/23_conversions/as_ref_mut.rs
+++ b/exercises/23_conversions/as_ref_mut.rs
@@ -26,6 +26,10 @@ fn num_sq<T>(arg: &mut T) {
???
}
+fn main() {
+ // You can optionally experiment here.
+}
+
#[cfg(test)]
mod tests {
use super::*;