Regression tests for Rustup breakage tracking issue #3913

tests/ui/explicit_iter_loop_no_sugg.rs

@@ -0,0 +1,7 @@
+// Tracking issue: #3913
+#![deny(clippy::explicit_iter_loop)]
+
+fn main() {
+    let vec = vec![1];
+    for _v in vec.iter() {} //~ ERROR change to `&vec`
+}

tests/ui/explicit_iter_loop_no_sugg.stderr

@@ -0,0 +1,14 @@
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
+  --> $DIR/explicit_iter_loop_no_sugg.rs:6:15
+   |
+LL |     for _v in vec.iter() {} //~ ERROR change to `&vec`
+   |               ^^^^^^^^^^ help: to write this more concisely, try: `&vec`
+   |
+note: lint level defined here
+  --> $DIR/explicit_iter_loop_no_sugg.rs:2:9
+   |
+LL | #![deny(clippy::explicit_iter_loop)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

tests/ui/into_iter_on_array_in_for_loop.rs

@@ -0,0 +1,6 @@
+// Tracking issue: #3913
+#![deny(clippy::into_iter_on_array)]
+
+fn main() {
+    for _ in [1, 2, 3].into_iter() {} //~ ERROR equivalent to .iter()
+}

tests/ui/into_iter_on_array_in_for_loop.stderr

@@ -0,0 +1,14 @@
+error: this .into_iter() call is equivalent to .iter() and will not move the array
+ --> $DIR/into_iter_on_ref.rs:5:24
+   |
+LL |     for _ in [1, 2, 3].into_iter() {} //~ ERROR equivalent to .iter()
+   |                        ^^^^^^^^^ help: call directly: `iter`
+   |
+   note: lint level defined here
+ --> $DIR/into_iter_on_ref.rs:2:9
+   |
+LL | #![deny(clippy::into_iter_on_array)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+