raise, don't fix for empty_let_in with comments

bin/tests/data/empty_let_in.nix

@@ -6,7 +6,8 @@
   )
   (
     let
-      # don't match this, we have a comment
+      # don't fix this, we have a comment
+      # raise the lint though
     in
     null
   )

bin/tests/snapshots/main__empty_let_in.snap

@@ -11,4 +11,12 @@ expression: "&out"
    · │              
    · ╰────────────── This let-in expression has no entries
 ───╯
+[W02] Warning: Useless let-in expression
+    ╭─[data/empty_let_in.nix:8:5]
+    │
+  8 │ ╭─▶     let
+ 12 │ ├─▶     null
+    · │              
+    · ╰────────────── This let-in expression has no entries
+────╯
 

lib/src/lints/empty_let_in.rs

@@ -1,5 +1,3 @@
-use std::ops::Not;
-
 use crate::{session::SessionInfo, Metadata, Report, Rule, Suggestion};
 
 use if_chain::if_chain;
@@ -49,15 +47,18 @@ impl Rule for EmptyLetIn {
             if let Some(body) = let_in_expr.body();
 
             // ensure that the let-in-expr does not have comments
-            if node
+            let has_comments = node
                 .children_with_tokens()
-                .any(|el| el.kind() == SyntaxKind::TOKEN_COMMENT)
-                .not();
+                .any(|el| el.kind() == SyntaxKind::TOKEN_COMMENT);
             then {
                 let at = node.text_range();
                 let replacement = body;
                 let message = "This let-in expression has no entries";
-                Some(self.report().suggest(at, message, Suggestion::new(at, replacement)))
+                Some(if has_comments {
+                    self.report().diagnostic(at, message)
+                } else {
+                    self.report().suggest(at, message, Suggestion::new(at, replacement))
+                })
             } else {
                 None
             }