Change set to deref_mut in test
@@ -316,7 +316,7 @@ mod tests {
assert_eq!(u32::try_from_slice(&env::storage_read(b"a").unwrap()).unwrap(), 42);
// New value is set
- a.set(49u32);
+ *a = Some(49u32);
assert!(a.is_some());
assert_eq!(a.get(), &Some(49));
