Add test case for same_item_push

clippy_lints/src/loops.rs

@@ -1114,6 +1114,7 @@ impl<'a, 'tcx> Visitor<'tcx> for ForPatternVisitor<'a, 'tcx> {
             | ExprKind::Cast(expr, _)
             | ExprKind::Type(expr, _)
             | ExprKind::AddrOf(_, _, expr)
+            | ExprKind::Field(expr, _)
             | ExprKind::Struct(_, _, Some(expr)) => self.visit_expr(expr),
             _ => {
                 // Exploration cannot continue ... calculate the hir_id of the current

tests/ui/same_item_push.rs

@@ -74,4 +74,16 @@ fn main() {
     for _ in 0..5 {
         println!("Same Item Push");
     }
+
+    struct A {
+        kind: u32,
+    }
+    let mut vec_a: Vec<A> = Vec::new();
+    for i in 0..30 {
+        vec_a.push(A{kind: i});
+    }
+    let mut vec12: Vec<u8> = Vec::new();
+    for a in vec_a {
+        vec12.push(2u8.pow(a.kind));
+    }
 }