Auto merge of rust-lang#11263 - c410-f3r:let-chain, r=Centri3

[`arithmetic_side_effects`] Fix rust-lang#11262

Fix rust-lang#11262

Rustc already handles paths that refer literals -> https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=d795058a2e1634c867288c20ff9432c8

```
changelog: [`arithmetic_side_effects`]: Ignore paths that refer literals
```

Author: bors

clippy_lints/src/operators/arithmetic_side_effects.rs

@@ -1,7 +1,7 @@
 use super::ARITHMETIC_SIDE_EFFECTS;
 use clippy_utils::consts::{constant, constant_simple, Constant};
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::{is_from_proc_macro, is_lint_allowed, peel_hir_expr_refs, peel_hir_expr_unary};
+use clippy_utils::{expr_or_init, is_from_proc_macro, is_lint_allowed, peel_hir_expr_refs, peel_hir_expr_unary};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::Ty;
@@ -138,8 +138,10 @@ impl ArithmeticSideEffects {
         ) {
             return;
         };
-        let (actual_lhs, lhs_ref_counter) = peel_hir_expr_refs(lhs);
-        let (actual_rhs, rhs_ref_counter) = peel_hir_expr_refs(rhs);
+        let (mut actual_lhs, lhs_ref_counter) = peel_hir_expr_refs(lhs);
+        let (mut actual_rhs, rhs_ref_counter) = peel_hir_expr_refs(rhs);
+        actual_lhs = expr_or_init(cx, actual_lhs);
+        actual_rhs = expr_or_init(cx, actual_rhs);
         let lhs_ty = cx.typeck_results().expr_ty(actual_lhs).peel_refs();
         let rhs_ty = cx.typeck_results().expr_ty(actual_rhs).peel_refs();
         if self.has_allowed_binary(lhs_ty, rhs_ty) {

tests/ui/arithmetic_side_effects.rs

@@ -486,4 +486,11 @@ pub fn issue_11145() {
     x += 1;
 }
 
+pub fn issue_11262() {
+    let one = 1;
+    let zero = 0;
+    let _ = 2 / one;
+    let _ = 2 / zero;
+}
+
 fn main() {}