Add suspicious group

.github/workflows/remark.yml

@@ -22,7 +22,7 @@ jobs:
       uses: actions/[email protected]
 
     - name: Install remark
-      run: npm install remark-cli remark-lint remark-lint-maximum-line-length remark-preset-lint-recommended
+      run: npm install remark-cli remark-lint remark-lint-maximum-line-length remark-preset-lint-recommended remark-gfm
 
     # Run
     - name: Check *.md files

.remarkrc

@@ -1,6 +1,7 @@
 {
   "plugins": [
     "remark-preset-lint-recommended",
+    "remark-gfm",
     ["remark-lint-list-item-indent", false],
     ["remark-lint-no-literal-urls", false],
     ["remark-lint-no-shortcut-reference-link", false],

README.md

@@ -10,16 +10,17 @@ A collection of lints to catch common mistakes and improve your [Rust](https://g
 Lints are divided into categories, each with a default [lint level](https://doc.rust-lang.org/rustc/lints/levels.html).
 You can choose how much Clippy is supposed to ~~annoy~~ help you by changing the lint level by category.
 
-| Category              | Description                                                             | Default level |
-| --------------------- | ----------------------------------------------------------------------- | ------------- |
-| `clippy::all`         | all lints that are on by default (correctness, style, complexity, perf) | **warn/deny** |
-| `clippy::correctness` | code that is outright wrong or very useless                             | **deny**      |
-| `clippy::style`       | code that should be written in a more idiomatic way                     | **warn**      |
-| `clippy::complexity`  | code that does something simple but in a complex way                    | **warn**      |
-| `clippy::perf`        | code that can be written to run faster                                  | **warn**      |
-| `clippy::pedantic`    | lints which are rather strict or might have false positives             | allow         |
-| `clippy::nursery`     | new lints that are still under development                              | allow         |
-| `clippy::cargo`       | lints for the cargo manifest                                            | allow         |
+| Category              | Description                                                                         | Default level |
+| --------------------- | ----------------------------------------------------------------------------------- | ------------- |
+| `clippy::all`         | all lints that are on by default (correctness, suspicious, style, complexity, perf) | **warn/deny** |
+| `clippy::correctness` | code that is outright wrong or useless                                              | **deny**      |
+| `clippy::suspicious`  | code that is most likely wrong or useless                                           | **warn**      |
+| `clippy::style`       | code that should be written in a more idiomatic way                                 | **warn**      |
+| `clippy::complexity`  | code that does something simple but in a complex way                                | **warn**      |
+| `clippy::perf`        | code that can be written to run faster                                              | **warn**      |
+| `clippy::pedantic`    | lints which are rather strict or might have false positives                         | allow         |
+| `clippy::nursery`     | new lints that are still under development                                          | allow         |
+| `clippy::cargo`       | lints for the cargo manifest                                                        | allow         |
 
 More to come, please [file an issue](https://github.com/rust-lang/rust-clippy/issues) if you have ideas!
 

clippy_dev/src/main.rs

@@ -137,6 +137,7 @@ fn get_clap_config<'a>() -> ArgMatches<'a> {
                         .possible_values(&[
                             "style",
                             "correctness",
+                            "suspicious",
                             "complexity",
                             "perf",
                             "pedantic",

clippy_dev/src/update_lints.rs

@@ -92,7 +92,10 @@ pub fn run(update_mode: UpdateMode) {
         || {
             // clippy::all should only include the following lint groups:
             let all_group_lints = usable_lints.iter().filter(|l| {
-                l.group == "correctness" || l.group == "style" || l.group == "complexity" || l.group == "perf"
+                matches!(
+                    &*l.group,
+                    "correctness" | "suspicious" | "style" | "complexity" | "perf"
+                )
             });
 
             gen_lint_group_list(all_group_lints)

clippy_lints/src/assign_ops.rs

@@ -55,7 +55,7 @@ declare_clippy_lint! {
     /// a += a + b;
     /// ```
     pub MISREFACTORED_ASSIGN_OP,
-    complexity,
+    suspicious,
     "having a variable on both sides of an assign op"
 }
 

clippy_lints/src/attrs.rs

@@ -173,7 +173,7 @@ declare_clippy_lint! {
     /// #![deny(clippy::as_conversions)]
     /// ```
     pub BLANKET_CLIPPY_RESTRICTION_LINTS,
-    style,
+    suspicious,
     "enabling the complete restriction group"
 }
 

clippy_lints/src/eval_order_dependence.rs

@@ -38,7 +38,7 @@ declare_clippy_lint! {
     /// let a = tmp + x;
     /// ```
     pub EVAL_ORDER_DEPENDENCE,
-    complexity,
+    suspicious,
     "whether a variable read occurs before a write depends on sub-expression evaluation order"
 }
 

clippy_lints/src/float_equality_without_abs.rs

@@ -36,7 +36,7 @@ declare_clippy_lint! {
      /// }
      /// ```
     pub FLOAT_EQUALITY_WITHOUT_ABS,
-    correctness,
+    suspicious,
     "float equality check without `.abs()`"
 }
 

clippy_lints/src/formatting.rs

@@ -22,7 +22,7 @@ declare_clippy_lint! {
     /// a =- 42; // confusing, should it be `a -= 42` or `a = -42`?
     /// ```
     pub SUSPICIOUS_ASSIGNMENT_FORMATTING,
-    style,
+    suspicious,
     "suspicious formatting of `*=`, `-=` or `!=`"
 }
 
@@ -44,7 +44,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub SUSPICIOUS_UNARY_OP_FORMATTING,
-    style,
+    suspicious,
     "suspicious formatting of unary `-` or `!` on the RHS of a BinOp"
 }
 
@@ -80,7 +80,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub SUSPICIOUS_ELSE_FORMATTING,
-    style,
+    suspicious,
     "suspicious formatting of `else`"
 }
 

clippy_lints/src/lib.rs

@@ -60,9 +60,9 @@ use rustc_session::Session;
 /// 4. The `description` that contains a short explanation on what's wrong with code where the
 ///    lint is triggered.
 ///
-/// Currently the categories `style`, `correctness`, `complexity` and `perf` are enabled by default.
-/// As said in the README.md of this repository, if the lint level mapping changes, please update
-/// README.md.
+/// Currently the categories `style`, `correctness`, `suspicious`, `complexity` and `perf` are
+/// enabled by default. As said in the README.md of this repository, if the lint level mapping
+/// changes, please update README.md.
 ///
 /// # Example
 ///
@@ -106,6 +106,11 @@ macro_rules! declare_clippy_lint {
             $(#[$attr])* pub clippy::$name, Deny, $description, report_in_external_macro: true
         }
     };
+    { $(#[$attr:meta])* pub $name:tt, suspicious, $description:tt } => {
+        declare_tool_lint! {
+            $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+        }
+    };
     { $(#[$attr:meta])* pub $name:tt, complexity, $description:tt } => {
         declare_tool_lint! {
             $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
@@ -1456,7 +1461,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_group(true, "clippy::style", Some("clippy_style"), vec![
         LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
         LintId::of(assign_ops::ASSIGN_OP_PATTERN),
-        LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
         LintId::of(blacklisted_name::BLACKLISTED_NAME),
         LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
         LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
@@ -1474,9 +1478,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(eq_op::OP_REF),
         LintId::of(eta_reduction::REDUNDANT_CLOSURE),
         LintId::of(float_literal::EXCESSIVE_PRECISION),
-        LintId::of(formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING),
-        LintId::of(formatting::SUSPICIOUS_ELSE_FORMATTING),
-        LintId::of(formatting::SUSPICIOUS_UNARY_OP_FORMATTING),
         LintId::of(from_over_into::FROM_OVER_INTO),
         LintId::of(from_str_radix_10::FROM_STR_RADIX_10),
         LintId::of(functions::DOUBLE_MUST_USE),
@@ -1489,7 +1490,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(len_zero::LEN_ZERO),
         LintId::of(literal_representation::INCONSISTENT_DIGIT_GROUPING),
         LintId::of(literal_representation::UNUSUAL_BYTE_GROUPINGS),
-        LintId::of(loops::EMPTY_LOOP),
         LintId::of(loops::FOR_KV_MAP),
         LintId::of(loops::NEEDLESS_RANGE_LOOP),
         LintId::of(loops::SAME_ITEM_PUSH),
@@ -1569,7 +1569,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     ]);
 
     store.register_group(true, "clippy::complexity", Some("clippy_complexity"), vec![
-        LintId::of(assign_ops::MISREFACTORED_ASSIGN_OP),
         LintId::of(attrs::DEPRECATED_CFG_ATTR),
         LintId::of(booleans::NONMINIMAL_BOOL),
         LintId::of(casts::CHAR_LIT_AS_U8),
@@ -1579,7 +1578,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(double_parens::DOUBLE_PARENS),
         LintId::of(duration_subsec::DURATION_SUBSEC),
         LintId::of(eval_order_dependence::DIVERGING_SUB_EXPRESSION),
-        LintId::of(eval_order_dependence::EVAL_ORDER_DEPENDENCE),
         LintId::of(explicit_write::EXPLICIT_WRITE),
         LintId::of(format::USELESS_FORMAT),
         LintId::of(functions::TOO_MANY_ARGUMENTS),
@@ -1590,7 +1588,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(lifetimes::NEEDLESS_LIFETIMES),
         LintId::of(loops::EXPLICIT_COUNTER_LOOP),
         LintId::of(loops::MANUAL_FLATTEN),
-        LintId::of(loops::MUT_RANGE_BOUND),
         LintId::of(loops::SINGLE_ELEMENT_LOOP),
         LintId::of(loops::WHILE_LET_LOOP),
         LintId::of(manual_strip::MANUAL_STRIP),
@@ -1614,7 +1611,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(methods::OPTION_FILTER_MAP),
         LintId::of(methods::SEARCH_IS_SOME),
         LintId::of(methods::SKIP_WHILE_NEXT),
-        LintId::of(methods::SUSPICIOUS_MAP),
         LintId::of(methods::UNNECESSARY_FILTER_MAP),
         LintId::of(methods::USELESS_ASREF),
         LintId::of(misc::SHORT_CIRCUIT_STATEMENT),
@@ -1683,7 +1679,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT),
         LintId::of(eq_op::EQ_OP),
         LintId::of(erasing_op::ERASING_OP),
-        LintId::of(float_equality_without_abs::FLOAT_EQUALITY_WITHOUT_ABS),
         LintId::of(formatting::POSSIBLE_MISSING_COMMA),
         LintId::of(functions::NOT_UNSAFE_PTR_ARG_DEREF),
         LintId::of(if_let_mutex::IF_LET_MUTEX),
@@ -1693,7 +1688,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(inline_fn_without_body::INLINE_FN_WITHOUT_BODY),
         LintId::of(let_underscore::LET_UNDERSCORE_LOCK),
         LintId::of(literal_representation::MISTYPED_LITERAL_SUFFIXES),
-        LintId::of(loops::FOR_LOOPS_OVER_FALLIBLES),
         LintId::of(loops::ITER_NEXT_LOOP),
         LintId::of(loops::NEVER_LOOP),
         LintId::of(loops::WHILE_IMMUTABLE_CONDITION),
@@ -1708,7 +1702,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(misc::CMP_NAN),
         LintId::of(misc::FLOAT_CMP),
         LintId::of(misc::MODULO_ONE),
-        LintId::of(mut_key::MUTABLE_KEY_TYPE),
         LintId::of(non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS),
         LintId::of(open_options::NONSENSICAL_OPEN_OPTIONS),
         LintId::of(option_env_unwrap::OPTION_ENV_UNWRAP),
@@ -1719,8 +1712,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(self_assignment::SELF_ASSIGNMENT),
         LintId::of(serde_api::SERDE_API_MISUSE),
         LintId::of(size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT),
-        LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
-        LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
         LintId::of(swap::ALMOST_SWAPPED),
         LintId::of(to_string_in_display::TO_STRING_IN_DISPLAY),
         LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
@@ -1737,6 +1728,23 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(vec_resize_to_zero::VEC_RESIZE_TO_ZERO),
     ]);
 
+    store.register_group(true, "clippy::suspicious", None, vec![
+        LintId::of(assign_ops::MISREFACTORED_ASSIGN_OP),
+        LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
+        LintId::of(eval_order_dependence::EVAL_ORDER_DEPENDENCE),
+        LintId::of(float_equality_without_abs::FLOAT_EQUALITY_WITHOUT_ABS),
+        LintId::of(formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING),
+        LintId::of(formatting::SUSPICIOUS_ELSE_FORMATTING),
+        LintId::of(formatting::SUSPICIOUS_UNARY_OP_FORMATTING),
+        LintId::of(loops::EMPTY_LOOP),
+        LintId::of(loops::FOR_LOOPS_OVER_FALLIBLES),
+        LintId::of(loops::MUT_RANGE_BOUND),
+        LintId::of(methods::SUSPICIOUS_MAP),
+        LintId::of(mut_key::MUTABLE_KEY_TYPE),
+        LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
+        LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
+    ]);
+
     store.register_group(true, "clippy::perf", Some("clippy_perf"), vec![
         LintId::of(entry::MAP_ENTRY),
         LintId::of(escape::BOXED_LOCAL),

clippy_lints/src/loops/mod.rs

@@ -199,7 +199,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub FOR_LOOPS_OVER_FALLIBLES,
-    correctness,
+    suspicious,
     "for-looping over an `Option` or a `Result`, which is more clearly expressed as an `if let`"
 }
 
@@ -313,7 +313,7 @@ declare_clippy_lint! {
     /// loop {}
     /// ```
     pub EMPTY_LOOP,
-    style,
+    suspicious,
     "empty `loop {}`, which should block or sleep"
 }
 
@@ -401,7 +401,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub MUT_RANGE_BOUND,
-    complexity,
+    suspicious,
     "for loop over a range where one of the bounds is a mutable variable"
 }
 

clippy_lints/src/methods/mod.rs

@@ -1248,7 +1248,7 @@ declare_clippy_lint! {
     /// let _ = (0..3).map(|x| x + 2).count();
     /// ```
     pub SUSPICIOUS_MAP,
-    complexity,
+    suspicious,
     "suspicious usage of map"
 }
 

clippy_lints/src/mut_key.rs

@@ -50,7 +50,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub MUTABLE_KEY_TYPE,
-    correctness,
+    suspicious,
     "Check for mutable `Map`/`Set` key type"
 }
 

clippy_lints/src/suspicious_trait_impl.rs

@@ -26,7 +26,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub SUSPICIOUS_ARITHMETIC_IMPL,
-    correctness,
+    suspicious,
     "suspicious use of operators in impl of arithmetic trait"
 }
 
@@ -47,7 +47,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub SUSPICIOUS_OP_ASSIGN_IMPL,
-    correctness,
+    suspicious,
     "suspicious use of operators in impl of OpAssign trait"
 }
 

clippy_lints/src/utils/internal_lints/metadata_collector.rs

@@ -47,8 +47,9 @@ const DEPRECATED_LINT_GROUP_STR: &str = "deprecated";
 const DEPRECATED_LINT_LEVEL: &str = "none";
 /// This array holds Clippy's lint groups with their corresponding default lint level. The
 /// lint level for deprecated lints is set in `DEPRECATED_LINT_LEVEL`.
-const DEFAULT_LINT_LEVELS: [(&str, &str); 8] = [
+const DEFAULT_LINT_LEVELS: &[(&str, &str)] = &[
     ("correctness", "deny"),
+    ("suspicious", "warn"),
     ("restriction", "allow"),
     ("style", "warn"),
     ("pedantic", "allow"),

tests/ui/mut_key.stderr

@@ -4,7 +4,7 @@ error: mutable key type
 LL | fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: `#[deny(clippy::mutable_key_type)]` on by default
+   = note: `-D clippy::mutable-key-type` implied by `-D warnings`
 
 error: mutable key type
   --> $DIR/mut_key.rs:27:72

tests/ui/suspicious_arithmetic_impl.stderr

@@ -12,7 +12,7 @@ error: suspicious use of binary operator in `AddAssign` impl
 LL |         *self = *self - other;
    |                       ^
    |
-   = note: `#[deny(clippy::suspicious_op_assign_impl)]` on by default
+   = note: `-D clippy::suspicious-op-assign-impl` implied by `-D warnings`
 
 error: suspicious use of binary operator in `MulAssign` impl
   --> $DIR/suspicious_arithmetic_impl.rs:32:16

util/lintlib.py

@@ -19,6 +19,7 @@
 
 lint_levels = {
     "correctness": 'Deny',
+    "suspicious": 'Warn',
     "style": 'Warn',
     "complexity": 'Warn',
     "perf": 'Warn',