fix suggestion code

and update stderr in tests.

Author: kyoto7250

clippy_lints/src/bytes_count_to_len.rs

@@ -31,7 +31,7 @@ declare_clippy_lint! {
     #[clippy::version = "1.62.0"]
     pub BYTES_COUNT_TO_LEN,
     complexity,
-    "Using bytes().count() when len() performs the same functionality"
+    "Using `bytes().count()` when `len()` performs the same functionality"
 }
 
 declare_lint_pass!(BytesCountToLen => [BYTES_COUNT_TO_LEN]);
@@ -40,7 +40,7 @@ impl<'tcx> LateLintPass<'tcx> for BytesCountToLen {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
         if_chain! {
             if let hir::ExprKind::MethodCall(expr_method, expr_args, _) = &expr.kind;
-            if expr_method.ident.name == rustc_span::sym::count;
+            if expr_method.ident.name == sym::count;
 
             if let [bytes_expr] = &**expr_args;
             if let hir::ExprKind::MethodCall(bytes_method, bytes_args, _) = &bytes_expr.kind;
@@ -57,7 +57,7 @@ impl<'tcx> LateLintPass<'tcx> for BytesCountToLen {
                     BYTES_COUNT_TO_LEN,
                     expr.span,
                     "using long and hard to read `.bytes().count()`",
-                    "consider calling `.len` instead",
+                    "consider calling `.len()` instead",
                     format!("{}.len()", snippet_with_applicability(cx, str_expr.span, "..", &mut applicability)),
                     applicability
                 );

tests/ui/bytes_count_to_len.stderr

@@ -2,27 +2,27 @@ error: using long and hard to read `.bytes().count()`
   --> $DIR/bytes_count_to_len.rs:8:13
    |
 LL |     let _ = String::from("foo").bytes().count();
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.len` instead: `String::from("foo").len()`
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.len()` instead: `String::from("foo").len()`
    |
    = note: `-D clippy::bytes-count-to-len` implied by `-D warnings`
 
 error: using long and hard to read `.bytes().count()`
   --> $DIR/bytes_count_to_len.rs:11:13
    |
 LL |     let _ = s1.bytes().count();
-   |             ^^^^^^^^^^^^^^^^^^ help: consider calling `.len` instead: `s1.len()`
+   |             ^^^^^^^^^^^^^^^^^^ help: consider calling `.len()` instead: `s1.len()`
 
 error: using long and hard to read `.bytes().count()`
   --> $DIR/bytes_count_to_len.rs:14:13
    |
 LL |     let _ = "foo".bytes().count();
-   |             ^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.len` instead: `"foo".len()`
+   |             ^^^^^^^^^^^^^^^^^^^^^ help: consider calling `.len()` instead: `"foo".len()`
 
 error: using long and hard to read `.bytes().count()`
   --> $DIR/bytes_count_to_len.rs:17:13
    |
 LL |     let _ = s2.bytes().count();
-   |             ^^^^^^^^^^^^^^^^^^ help: consider calling `.len` instead: `s2.len()`
+   |             ^^^^^^^^^^^^^^^^^^ help: consider calling `.len()` instead: `s2.len()`
 
 error: aborting due to 4 previous errors