refactored the code

Author: Samarth1696

clippy_lints/src/non_zero_suggestions.rs

@@ -48,23 +48,22 @@ declare_lint_pass!(NonZeroSuggestions => [NON_ZERO_SUGGESTIONS]);
 
 impl<'tcx> LateLintPass<'tcx> for NonZeroSuggestions {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
-        if let ExprKind::Call(func, [arg]) = expr.kind {
-            if let ExprKind::Path(qpath) = &func.kind {
-                if let Some(def_id) = cx.qpath_res(qpath, func.hir_id).opt_def_id() {
-                    let fn_name = cx.tcx.item_name(def_id);
-                    let target_ty = cx.typeck_results().expr_ty(expr);
+        if let ExprKind::Call(func, [arg]) = expr.kind
+            && let ExprKind::Path(qpath) = &func.kind
+            && let Some(def_id) = cx.qpath_res(qpath, func.hir_id).opt_def_id()
+            && let ExprKind::MethodCall(rcv_path, receiver, _, _) = &arg.kind
+        {
+            let fn_name = cx.tcx.item_name(def_id);
+            let target_ty = cx.typeck_results().expr_ty(expr);
+            let receiver_ty = cx.typeck_results().expr_ty(receiver);
 
-                    if let ExprKind::MethodCall(rcv_path, receiver, _, _) = &arg.kind {
-                        let receiver_ty = cx.typeck_results().expr_ty(receiver);
-                        if let ty::Adt(adt_def, _) = receiver_ty.kind() {
-                            if adt_def.is_struct() && cx.tcx.get_diagnostic_name(adt_def.did()) == Some(sym::NonZero) {
-                                if let Some(target_non_zero_type) = get_target_non_zero_type(target_ty) {
-                                    let arg_snippet = get_arg_snippet(cx, arg, rcv_path);
-                                    suggest_non_zero_conversion(cx, expr, fn_name, target_non_zero_type, &arg_snippet);
-                                }
-                            }
-                        }
-                    }
+            if let ty::Adt(adt_def, _) = receiver_ty.kind()
+                && adt_def.is_struct()
+                && cx.tcx.get_diagnostic_name(adt_def.did()) == Some(sym::NonZero)
+            {
+                if let Some(target_non_zero_type) = get_target_non_zero_type(target_ty) {
+                    let arg_snippet = get_arg_snippet(cx, arg, rcv_path);
+                    suggest_non_zero_conversion(cx, expr, fn_name, target_non_zero_type, &arg_snippet);
                 }
             }
         }