As someone who has written some 10,000 lines of Rust, if this comma is intentional this is just frankly unreadable:
adapt(
|data: &mut Arc<Parent>, thunk| {
let mut child = data.child.clone();
thunk.call(&mut child), // <-- HERE
if !Arc::ptr_eq(&data.child, &child) {
Arc::make_mut(data).child = child;
}
},
child_view(...) // which has Arc<Child> as its app data type
)
