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fix(integer_division_remainder_used): also detect inherent division/r… #17618

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44 changes: 41 additions & 3 deletions clippy_lints/src/operators/integer_division_remainder_used.rs
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Original file line number Diff line number Diff line change
@@ -1,11 +1,11 @@
use super::INTEGER_DIVISION_REMAINDER_USED;
use clippy_utils::diagnostics::span_lint;
use clippy_utils::sym;
use rustc_ast::BinOpKind;
use rustc_hir::Expr;
use rustc_lint::{LateContext, LintContext as _};
use rustc_middle::ty;
use rustc_span::Span;

use super::INTEGER_DIVISION_REMAINDER_USED;
use rustc_span::{Span, Symbol};

pub(super) fn check(cx: &LateContext<'_>, op: BinOpKind, lhs: &Expr<'_>, rhs: &Expr<'_>, span: Span) {
if let BinOpKind::Div | BinOpKind::Rem = op
Expand All @@ -23,3 +23,41 @@ pub(super) fn check(cx: &LateContext<'_>, op: BinOpKind, lhs: &Expr<'_>, rhs: &E
);
}
}
// check method call is present in specific list if yes also lint it
pub(super) fn check_method_call(cx: &LateContext<'_>, method_name: Symbol, receiver: &Expr<'_>, span: Span) {
if matches!(
method_name,
sym::checked_div
| sym::checked_div_euclid
| sym::checked_div_exact
| sym::checked_rem
| sym::checked_rem_euclid
| sym::div_ceil
| sym::div_euclid
| sym::div_exact
| sym::overflowing_div
| sym::overflowing_div_euclid
| sym::overflowing_rem
| sym::overflowing_rem_euclid
| sym::rem_euclid
| sym::strict_div
| sym::strict_div_euclid
| sym::saturating_div
| sym::strict_rem
| sym::strict_rem_euclid
| sym::wrapping_div
| sym::wrapping_div_euclid
| sym::wrapping_rem
| sym::wrapping_rem_euclid,
) {
let instance_ty = cx.typeck_results().expr_ty(receiver);
if matches!(instance_ty.peel_refs().kind(), ty::Int(_) | ty::Uint(_)) {
span_lint(
cx,
INTEGER_DIVISION_REMAINDER_USED,
span.source_callsite(),
format!("use of `{method_name}` has been disallowed in this context"),
);
}
}
}
3 changes: 3 additions & 0 deletions clippy_lints/src/operators/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1087,6 +1087,9 @@ impl<'tcx> LateLintPass<'tcx> for Operators {
);
manual_div_ceil::check(cx, e, op.node, lhs, rhs, self.msrv);
},
ExprKind::MethodCall(path, receiver, _args, span) => {
integer_division_remainder_used::check_method_call(cx, path.ident.name, receiver, span);
},
ExprKind::AssignOp(op, lhs, rhs) => {
let bin_op = op.node.into();
if !e.span.from_expansion() {
Expand Down
16 changes: 16 additions & 0 deletions clippy_utils/src/sym.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -170,9 +170,13 @@ generate! {
check_attributes,
checked_abs,
checked_add,
checked_div,
checked_div_euclid,
checked_div_exact,
checked_isqrt,
checked_mul,
checked_pow,
checked_rem,
checked_rem_euclid,
checked_sub,
child_id,
Expand Down Expand Up @@ -213,6 +217,9 @@ generate! {
deref_mut_method,
diagnostics,
disallowed_types,
div_ceil,
div_euclid,
div_exact,
drain,
dump,
duration_constructors,
Expand Down Expand Up @@ -461,6 +468,10 @@ generate! {
os_str_to_os_string,
os_string_as_os_str,
outer_expn,
overflowing_div,
overflowing_div_euclid,
overflowing_rem,
overflowing_rem_euclid,
panic_any,
parse,
partition,
Expand Down Expand Up @@ -582,6 +593,10 @@ generate! {
str_trim,
str_trim_end,
str_trim_start,
strict_div,
strict_div_euclid,
strict_rem,
strict_rem_euclid,
string_as_mut_str,
string_as_str,
string_from_utf8,
Expand Down Expand Up @@ -653,6 +668,7 @@ generate! {
warnings,
wildcard_imports,
with_capacity,
wrapping_div_euclid,
wrapping_neg,
wrapping_offset,
write,
Expand Down
50 changes: 50 additions & 0 deletions tests/ui/integer_division_remainder_used.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,56 @@ impl std::ops::Rem for CustomOps {
}
}

fn issue17603() {
let x: u16 = 7;

let _ = x.checked_div(3);
//~^ integer_division_remainder_used
let _ = x.checked_div_euclid(3);
//~^ integer_division_remainder_used
let _ = x.checked_rem(3);
//~^ integer_division_remainder_used
let _ = x.checked_rem_euclid(3);
//~^ integer_division_remainder_used
let _ = x.div_ceil(3);
//~^ integer_division_remainder_used
let _ = x.div_euclid(3);
//~^ integer_division_remainder_used
let _ = x.overflowing_div(3);
//~^ integer_division_remainder_used
let _ = x.overflowing_div_euclid(3);
//~^ integer_division_remainder_used
let _ = x.overflowing_rem(3);
//~^ integer_division_remainder_used
let _ = x.overflowing_rem_euclid(3);
//~^ integer_division_remainder_used
let _ = x.rem_euclid(3);
//~^ integer_division_remainder_used
let _ = x.strict_div(3);
//~^ integer_division_remainder_used
let _ = x.strict_div_euclid(3);
//~^ integer_division_remainder_used
let _ = x.saturating_div(3);
//~^ integer_division_remainder_used
let _ = x.strict_rem(3);
//~^ integer_division_remainder_used
let _ = x.strict_rem_euclid(3);
//~^ integer_division_remainder_used
let _ = x.wrapping_div(3);
//~^ integer_division_remainder_used
let _ = x.wrapping_div_euclid(3);
//~^ integer_division_remainder_used
let _ = x.wrapping_rem(3);
//~^ integer_division_remainder_used
let _ = x.wrapping_rem_euclid(3);
//~^ integer_division_remainder_used

// methods that also exist on floats should not trigger there
let f: f64 = 7.0;
let _ = f.div_euclid(3.0);
let _ = f.rem_euclid(3.0);
}
Comment on lines +24 to +71

@CommanderStorm CommanderStorm Aug 23, 2026

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for each of the methods noted above, I would expect one testcase, so please copy paste the list and add a testcase for each 😉

Since div_euclid does not lint here, also keep the cases where it lints and does not for each.


fn main() {
// should trigger
let a = 10;
Expand Down
142 changes: 131 additions & 11 deletions tests/ui/integer_division_remainder_used.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -13,62 +13,182 @@ error: use of `%` has been disallowed in this context
LL | Self(self.0 % rhs.0)
| ^^^^^^^^^^^^^^

error: use of `checked_div` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:26:15
|
LL | let _ = x.checked_div(3);
| ^^^^^^^^^^^^^^

error: use of `checked_div_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:28:15
|
LL | let _ = x.checked_div_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^^

error: use of `checked_rem` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:30:15
|
LL | let _ = x.checked_rem(3);
| ^^^^^^^^^^^^^^

error: use of `checked_rem_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:32:15
|
LL | let _ = x.checked_rem_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^^

error: use of `div_ceil` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:34:15
|
LL | let _ = x.div_ceil(3);
| ^^^^^^^^^^^

error: use of `div_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:36:15
|
LL | let _ = x.div_euclid(3);
| ^^^^^^^^^^^^^

error: use of `overflowing_div` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:38:15
|
LL | let _ = x.overflowing_div(3);
| ^^^^^^^^^^^^^^^^^^

error: use of `overflowing_div_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:40:15
|
LL | let _ = x.overflowing_div_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^

error: use of `overflowing_rem` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:42:15
|
LL | let _ = x.overflowing_rem(3);
| ^^^^^^^^^^^^^^^^^^

error: use of `overflowing_rem_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:44:15
|
LL | let _ = x.overflowing_rem_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^

error: use of `rem_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:46:15
|
LL | let _ = x.rem_euclid(3);
| ^^^^^^^^^^^^^

error: use of `strict_div` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:48:15
|
LL | let _ = x.strict_div(3);
| ^^^^^^^^^^^^^

error: use of `strict_div_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:50:15
|
LL | let _ = x.strict_div_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^

error: use of `saturating_div` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:52:15
|
LL | let _ = x.saturating_div(3);
| ^^^^^^^^^^^^^^^^^

error: use of `strict_rem` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:54:15
|
LL | let _ = x.strict_rem(3);
| ^^^^^^^^^^^^^

error: use of `strict_rem_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:56:15
|
LL | let _ = x.strict_rem_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^

error: use of `wrapping_div` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:58:15
|
LL | let _ = x.wrapping_div(3);
| ^^^^^^^^^^^^^^^

error: use of `wrapping_div_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:60:15
|
LL | let _ = x.wrapping_div_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^^^

error: use of `wrapping_rem` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:62:15
|
LL | let _ = x.wrapping_rem(3);
| ^^^^^^^^^^^^^^^

error: use of `wrapping_rem_euclid` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:64:15
|
LL | let _ = x.wrapping_rem_euclid(3);
| ^^^^^^^^^^^^^^^^^^^^^^

error: use of `/` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:27:13
--> tests/ui/integer_division_remainder_used.rs:77:13
|
LL | let c = a / b;
| ^^^^^

error: use of `%` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:29:13
--> tests/ui/integer_division_remainder_used.rs:79:13
|
LL | let d = a % b;
| ^^^^^

error: use of `/` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:31:13
--> tests/ui/integer_division_remainder_used.rs:81:13
|
LL | let e = &a / b;
| ^^^^^^

error: use of `%` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:33:13
--> tests/ui/integer_division_remainder_used.rs:83:13
|
LL | let f = a % &b;
| ^^^^^^

error: use of `/` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:35:13
--> tests/ui/integer_division_remainder_used.rs:85:13
|
LL | let g = &a / &b;
| ^^^^^^^

error: use of `%` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:37:13
--> tests/ui/integer_division_remainder_used.rs:87:13
|
LL | let h = &10 % b;
| ^^^^^^^

error: use of `/` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:39:13
--> tests/ui/integer_division_remainder_used.rs:89:13
|
LL | let i = a / &4;
| ^^^^^^

error: use of `/` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:44:5
--> tests/ui/integer_division_remainder_used.rs:94:5
|
LL | j /= 2;
| ^^^^^^

error: use of `%` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:46:5
--> tests/ui/integer_division_remainder_used.rs:96:5
|
LL | j %= 3;
| ^^^^^^

error: use of `%` has been disallowed in this context
--> tests/ui/integer_division_remainder_used.rs:60:13
--> tests/ui/integer_division_remainder_used.rs:110:13
|
LL | $a % $b
| ^^^^^^^
Expand All @@ -78,5 +198,5 @@ LL | let issue17048 = mac!(a, b);
|
= note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 12 previous errors
error: aborting due to 32 previous errors