make clippy happy

Author: y21

clippy_utils/src/lib.rs

@@ -2003,8 +2003,6 @@ pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool
     /// * `|(x, y)| (x, y)`
     /// * `|(x, y)| { return (x, y); }`
     fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool {
-        let [param] = func.params else { return false; };
-
         fn check_pat(cx: &LateContext<'_>, pat: &Pat<'_>, expr: &Expr<'_>) -> bool {
             let is_path_to_local =
                 |expr, id| path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty();
@@ -2020,6 +2018,8 @@ pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool
             }
         }
 
+        let [param] = func.params else { return false; };
+
         let mut expr = func.value;
         loop {
             match expr.kind {