Don't suggest wrong snippet in closure

src/test/ui/suggestions/option-content-move2.rs

@@ -0,0 +1,16 @@
+struct NotCopyable;
+
+fn func<F: FnMut() -> H, H: FnMut()>(_: F) {}
+
+fn parse() {
+    let mut var = None;
+    func(|| {
+        // Shouldn't suggest `move ||.as_ref()` here
+        move || {
+        //~^ ERROR: cannot move out of `var`
+            var = Some(NotCopyable);
+        }
+    });
+}
+
+fn main() {}

src/test/ui/suggestions/option-content-move2.stderr

@@ -0,0 +1,18 @@
+error[E0507]: cannot move out of `var`, a captured variable in an `FnMut` closure
+  --> $DIR/option-content-move2.rs:9:9
+   |
+LL |     let mut var = None;
+   |         ------- captured outer variable
+...
+LL |         move || {
+   |         ^^^^^^^ move out of `var` occurs here
+LL |
+LL |             var = Some(NotCopyable);
+   |             ---
+   |             |
+   |             move occurs because `var` has type `std::option::Option<NotCopyable>`, which does not implement the `Copy` trait
+   |             move occurs due to use in closure
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0507`.