found a solution to print the Type (T) of a variable

https://stackoverflow.com/a/58119924

src/main.rs

@@ -1,9 +1,14 @@
 fn main() {
     let v: Vec<i8> = vec![10, 20, 30];
-    let mut iter = v.into_iter();
+    let mut iter = v.iter();
 
     println!("v[0]: {:?}", iter.next());
 
-    let v1: Option<i8> = iter.next();
+    let v1: Option<&i8> = iter.next();
     println!("v[1]: {v1:?}");
+    print_type_name(&v1);
+}
+
+fn print_type_name<T>(_: &T) {
+    println!("{}", std::any::type_name::<T>());
 }