[arithmetic-side-effects] Consider negative numbers and add more tests

clippy_lints/src/operators/arithmetic_side_effects.rs

@@ -2,7 +2,7 @@ use super::ARITHMETIC_SIDE_EFFECTS;
 use clippy_utils::{
     consts::{constant, constant_simple},
     diagnostics::span_lint,
-    peel_hir_expr_refs,
+    peel_hir_expr_refs, peel_hir_expr_unary,
 };
 use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
@@ -98,8 +98,11 @@ impl ArithmeticSideEffects {
     }
 
     /// If `expr` is not a literal integer like `1`, returns `None`.
+    ///
+    /// Returns the absolute value of the expression, if this is an integer literal.
     fn literal_integer(expr: &hir::Expr<'_>) -> Option<u128> {
-        if let hir::ExprKind::Lit(ref lit) = expr.kind && let ast::LitKind::Int(n, _) = lit.node {
+        let actual = peel_hir_expr_unary(expr).0;
+        if let hir::ExprKind::Lit(ref lit) = actual.kind && let ast::LitKind::Int(n, _) = lit.node {
             Some(n)
         }
         else {
@@ -123,12 +126,12 @@ impl ArithmeticSideEffects {
         if !matches!(
             op.node,
             hir::BinOpKind::Add
-                | hir::BinOpKind::Sub
-                | hir::BinOpKind::Mul
                 | hir::BinOpKind::Div
+                | hir::BinOpKind::Mul
                 | hir::BinOpKind::Rem
                 | hir::BinOpKind::Shl
                 | hir::BinOpKind::Shr
+                | hir::BinOpKind::Sub
         ) {
             return;
         };

clippy_utils/src/lib.rs

@@ -2258,6 +2258,18 @@ pub fn peel_n_hir_expr_refs<'a>(expr: &'a Expr<'a>, count: usize) -> (&'a Expr<'
     (e, count - remaining)
 }
 
+/// Peels off all unary operators of an expression. Returns the underlying expression and the number
+/// of operators removed.
+pub fn peel_hir_expr_unary<'a>(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
+    let mut count: usize = 0;
+    let mut curr_expr = expr;
+    while let ExprKind::Unary(_, local_expr) = curr_expr.kind {
+        count = count.wrapping_add(1);
+        curr_expr = local_expr;
+    }
+    (curr_expr, count)
+}
+
 /// Peels off all references on the expression. Returns the underlying expression and the number of
 /// references removed.
 pub fn peel_hir_expr_refs<'a>(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {

tests/ui-toml/arithmetic_side_effects_allowed/arithmetic_side_effects_allowed.rs

@@ -107,7 +107,7 @@ fn rhs_is_different() {
 fn unary() {
     // is explicitly on the list
     let _ = -OutOfNames;
-    // is specifically on the list
+    // is explicitly on the list
     let _ = -Foo;
     // not on the list
     let _ = -Bar;

tests/ui/arithmetic_side_effects.rs

@@ -2,6 +2,7 @@
     clippy::assign_op_pattern,
     clippy::erasing_op,
     clippy::identity_op,
+    clippy::no_effect,
     clippy::op_ref,
     clippy::unnecessary_owned_empty_strings,
     arithmetic_overflow,
@@ -125,6 +126,18 @@ pub fn non_overflowing_ops_or_ops_already_handled_by_the_compiler_should_not_tri
     _n *= &0;
     _n *= 1;
     _n *= &1;
+    _n += -0;
+    _n += &-0;
+    _n -= -0;
+    _n -= &-0;
+    _n /= -99;
+    _n /= &-99;
+    _n %= -99;
+    _n %= &-99;
+    _n *= -0;
+    _n *= &-0;
+    _n *= -1;
+    _n *= &-1;
 
     // Binary
     _n = _n + 0;
@@ -158,7 +171,7 @@ pub fn non_overflowing_ops_or_ops_already_handled_by_the_compiler_should_not_tri
     _n = -&i32::MIN;
 }
 
-pub fn runtime_ops() {
+pub fn unknown_ops_or_runtime_ops_that_can_overflow() {
     let mut _n = i32::MAX;
 
     // Assign
@@ -172,6 +185,16 @@ pub fn runtime_ops() {
     _n %= &0;
     _n *= 2;
     _n *= &2;
+    _n += -1;
+    _n += &-1;
+    _n -= -1;
+    _n -= &-1;
+    _n /= -0;
+    _n /= &-0;
+    _n %= -0;
+    _n %= &-0;
+    _n *= -2;
+    _n *= &-2;
 
     // Binary
     _n = _n + 1;
@@ -225,4 +248,46 @@ pub fn runtime_ops() {
     _n = -&_n;
 }
 
+// Copied and pasted from the `integer_arithmetic` lint for comparison.
+pub fn integer_arithmetic() {
+    let mut i = 1i32;
+    let mut var1 = 0i32;
+    let mut var2 = -1i32;
+
+    1 + i;
+    i * 2;
+    1 % i / 2;
+    i - 2 + 2 - i;
+    -i;
+    i >> 1;
+    i << 1;
+
+    -1;
+    -(-1);
+
+    i & 1;
+    i | 1;
+    i ^ 1;
+
+    i += 1;
+    i -= 1;
+    i *= 2;
+    i /= 2;
+    i /= 0;
+    i /= -1;
+    i /= var1;
+    i /= var2;
+    i %= 2;
+    i %= 0;
+    i %= -1;
+    i %= var1;
+    i %= var2;
+    i <<= 3;
+    i >>= 2;
+
+    i |= 1;
+    i &= 1;
+    i ^= i;
+}
+
 fn main() {}

tests/ui/arithmetic_side_effects.stderr

@@ -1,5 +1,5 @@
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:165:5
+  --> $DIR/arithmetic_side_effects.rs:178:5
    |
 LL |     _n += 1;
    |     ^^^^^^^
@@ -7,328 +7,490 @@ LL |     _n += 1;
    = note: `-D clippy::arithmetic-side-effects` implied by `-D warnings`
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:166:5
+  --> $DIR/arithmetic_side_effects.rs:179:5
    |
 LL |     _n += &1;
    |     ^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:167:5
+  --> $DIR/arithmetic_side_effects.rs:180:5
    |
 LL |     _n -= 1;
    |     ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:168:5
+  --> $DIR/arithmetic_side_effects.rs:181:5
    |
 LL |     _n -= &1;
    |     ^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:169:5
+  --> $DIR/arithmetic_side_effects.rs:182:5
    |
 LL |     _n /= 0;
    |     ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:170:5
+  --> $DIR/arithmetic_side_effects.rs:183:5
    |
 LL |     _n /= &0;
    |     ^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:171:5
+  --> $DIR/arithmetic_side_effects.rs:184:5
    |
 LL |     _n %= 0;
    |     ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:172:5
+  --> $DIR/arithmetic_side_effects.rs:185:5
    |
 LL |     _n %= &0;
    |     ^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:173:5
+  --> $DIR/arithmetic_side_effects.rs:186:5
    |
 LL |     _n *= 2;
    |     ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:174:5
+  --> $DIR/arithmetic_side_effects.rs:187:5
    |
 LL |     _n *= &2;
    |     ^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:177:10
+  --> $DIR/arithmetic_side_effects.rs:188:5
+   |
+LL |     _n += -1;
+   |     ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:189:5
+   |
+LL |     _n += &-1;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:190:5
+   |
+LL |     _n -= -1;
+   |     ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:191:5
+   |
+LL |     _n -= &-1;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:192:5
+   |
+LL |     _n /= -0;
+   |     ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:193:5
+   |
+LL |     _n /= &-0;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:194:5
+   |
+LL |     _n %= -0;
+   |     ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:195:5
+   |
+LL |     _n %= &-0;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:196:5
+   |
+LL |     _n *= -2;
+   |     ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:197:5
+   |
+LL |     _n *= &-2;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:200:10
    |
 LL |     _n = _n + 1;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:178:10
+  --> $DIR/arithmetic_side_effects.rs:201:10
    |
 LL |     _n = _n + &1;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:179:10
+  --> $DIR/arithmetic_side_effects.rs:202:10
    |
 LL |     _n = 1 + _n;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:180:10
+  --> $DIR/arithmetic_side_effects.rs:203:10
    |
 LL |     _n = &1 + _n;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:181:10
+  --> $DIR/arithmetic_side_effects.rs:204:10
    |
 LL |     _n = _n - 1;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:182:10
+  --> $DIR/arithmetic_side_effects.rs:205:10
    |
 LL |     _n = _n - &1;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:183:10
+  --> $DIR/arithmetic_side_effects.rs:206:10
    |
 LL |     _n = 1 - _n;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:184:10
+  --> $DIR/arithmetic_side_effects.rs:207:10
    |
 LL |     _n = &1 - _n;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:185:10
+  --> $DIR/arithmetic_side_effects.rs:208:10
    |
 LL |     _n = _n / 0;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:186:10
+  --> $DIR/arithmetic_side_effects.rs:209:10
    |
 LL |     _n = _n / &0;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:187:10
+  --> $DIR/arithmetic_side_effects.rs:210:10
    |
 LL |     _n = _n % 0;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:188:10
+  --> $DIR/arithmetic_side_effects.rs:211:10
    |
 LL |     _n = _n % &0;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:189:10
+  --> $DIR/arithmetic_side_effects.rs:212:10
    |
 LL |     _n = _n * 2;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:190:10
+  --> $DIR/arithmetic_side_effects.rs:213:10
    |
 LL |     _n = _n * &2;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:191:10
+  --> $DIR/arithmetic_side_effects.rs:214:10
    |
 LL |     _n = 2 * _n;
    |          ^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:192:10
+  --> $DIR/arithmetic_side_effects.rs:215:10
    |
 LL |     _n = &2 * _n;
    |          ^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:193:10
+  --> $DIR/arithmetic_side_effects.rs:216:10
    |
 LL |     _n = 23 + &85;
    |          ^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:194:10
+  --> $DIR/arithmetic_side_effects.rs:217:10
    |
 LL |     _n = &23 + 85;
    |          ^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:195:10
+  --> $DIR/arithmetic_side_effects.rs:218:10
    |
 LL |     _n = &23 + &85;
    |          ^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:198:13
+  --> $DIR/arithmetic_side_effects.rs:221:13
    |
 LL |     let _ = Custom + 0;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:199:13
+  --> $DIR/arithmetic_side_effects.rs:222:13
    |
 LL |     let _ = Custom + 1;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:200:13
+  --> $DIR/arithmetic_side_effects.rs:223:13
    |
 LL |     let _ = Custom + 2;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:201:13
+  --> $DIR/arithmetic_side_effects.rs:224:13
    |
 LL |     let _ = Custom + 0.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:202:13
+  --> $DIR/arithmetic_side_effects.rs:225:13
    |
 LL |     let _ = Custom + 1.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:203:13
+  --> $DIR/arithmetic_side_effects.rs:226:13
    |
 LL |     let _ = Custom + 2.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:204:13
+  --> $DIR/arithmetic_side_effects.rs:227:13
    |
 LL |     let _ = Custom - 0;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:205:13
+  --> $DIR/arithmetic_side_effects.rs:228:13
    |
 LL |     let _ = Custom - 1;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:206:13
+  --> $DIR/arithmetic_side_effects.rs:229:13
    |
 LL |     let _ = Custom - 2;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:207:13
+  --> $DIR/arithmetic_side_effects.rs:230:13
    |
 LL |     let _ = Custom - 0.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:208:13
+  --> $DIR/arithmetic_side_effects.rs:231:13
    |
 LL |     let _ = Custom - 1.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:209:13
+  --> $DIR/arithmetic_side_effects.rs:232:13
    |
 LL |     let _ = Custom - 2.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:210:13
+  --> $DIR/arithmetic_side_effects.rs:233:13
    |
 LL |     let _ = Custom / 0;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:211:13
+  --> $DIR/arithmetic_side_effects.rs:234:13
    |
 LL |     let _ = Custom / 1;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:212:13
+  --> $DIR/arithmetic_side_effects.rs:235:13
    |
 LL |     let _ = Custom / 2;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:213:13
+  --> $DIR/arithmetic_side_effects.rs:236:13
    |
 LL |     let _ = Custom / 0.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:214:13
+  --> $DIR/arithmetic_side_effects.rs:237:13
    |
 LL |     let _ = Custom / 1.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:215:13
+  --> $DIR/arithmetic_side_effects.rs:238:13
    |
 LL |     let _ = Custom / 2.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:216:13
+  --> $DIR/arithmetic_side_effects.rs:239:13
    |
 LL |     let _ = Custom * 0;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:217:13
+  --> $DIR/arithmetic_side_effects.rs:240:13
    |
 LL |     let _ = Custom * 1;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:218:13
+  --> $DIR/arithmetic_side_effects.rs:241:13
    |
 LL |     let _ = Custom * 2;
    |             ^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:219:13
+  --> $DIR/arithmetic_side_effects.rs:242:13
    |
 LL |     let _ = Custom * 0.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:220:13
+  --> $DIR/arithmetic_side_effects.rs:243:13
    |
 LL |     let _ = Custom * 1.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:221:13
+  --> $DIR/arithmetic_side_effects.rs:244:13
    |
 LL |     let _ = Custom * 2.0;
    |             ^^^^^^^^^^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:224:10
+  --> $DIR/arithmetic_side_effects.rs:247:10
    |
 LL |     _n = -_n;
    |          ^^^
 
 error: arithmetic operation that can potentially result in unexpected side-effects
-  --> $DIR/arithmetic_side_effects.rs:225:10
+  --> $DIR/arithmetic_side_effects.rs:248:10
    |
 LL |     _n = -&_n;
    |          ^^^^
 
-error: aborting due to 55 previous errors
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:257:5
+   |
+LL |     1 + i;
+   |     ^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:258:5
+   |
+LL |     i * 2;
+   |     ^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:260:5
+   |
+LL |     i - 2 + 2 - i;
+   |     ^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:261:5
+   |
+LL |     -i;
+   |     ^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:262:5
+   |
+LL |     i >> 1;
+   |     ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:263:5
+   |
+LL |     i << 1;
+   |     ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:272:5
+   |
+LL |     i += 1;
+   |     ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:273:5
+   |
+LL |     i -= 1;
+   |     ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:274:5
+   |
+LL |     i *= 2;
+   |     ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:276:5
+   |
+LL |     i /= 0;
+   |     ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:278:5
+   |
+LL |     i /= var1;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:279:5
+   |
+LL |     i /= var2;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:281:5
+   |
+LL |     i %= 0;
+   |     ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:283:5
+   |
+LL |     i %= var1;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:284:5
+   |
+LL |     i %= var2;
+   |     ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:285:5
+   |
+LL |     i <<= 3;
+   |     ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+  --> $DIR/arithmetic_side_effects.rs:286:5
+   |
+LL |     i >>= 2;
+   |     ^^^^^^^
+
+error: aborting due to 82 previous errors