Auto merge of rust-lang#95273 - flip1995:clippyup, r=manishearth

Update Clippy

r? `@Manishearth`

Author: bors

src/tools/clippy/.github/ISSUE_TEMPLATE/bug_report.yml

@@ -18,7 +18,7 @@ body:
     id: reproducer
     attributes:
       label: Reproducer
-      description: Please provide the code and steps to repoduce the bug
+      description: Please provide the code and steps to reproduce the bug
       value: |
         I tried this code:
 

src/tools/clippy/CHANGELOG.md

@@ -3069,6 +3069,7 @@ Released 2018-09-13
 [`bytes_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#bytes_nth
 [`cargo_common_metadata`]: https://rust-lang.github.io/rust-clippy/master/index.html#cargo_common_metadata
 [`case_sensitive_file_extension_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#case_sensitive_file_extension_comparisons
+[`cast_enum_constructor`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_enum_constructor
 [`cast_enum_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_enum_truncation
 [`cast_lossless`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
 [`cast_possible_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_truncation
@@ -3366,6 +3367,7 @@ Released 2018-09-13
 [`option_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unit_fn
 [`option_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#option_option
 [`or_fun_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call
+[`or_then_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#or_then_unwrap
 [`out_of_bounds_indexing`]: https://rust-lang.github.io/rust-clippy/master/index.html#out_of_bounds_indexing
 [`overflow_check_conditional`]: https://rust-lang.github.io/rust-clippy/master/index.html#overflow_check_conditional
 [`panic`]: https://rust-lang.github.io/rust-clippy/master/index.html#panic
@@ -3506,6 +3508,7 @@ Released 2018-09-13
 [`unnecessary_filter_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
 [`unnecessary_find_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_find_map
 [`unnecessary_fold`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold
+[`unnecessary_join`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_join
 [`unnecessary_lazy_evaluations`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_lazy_evaluations
 [`unnecessary_mut_passed`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
 [`unnecessary_operation`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_operation

src/tools/clippy/clippy_lints/src/casts/cast_enum_constructor.rs

@@ -0,0 +1,21 @@
+use clippy_utils::diagnostics::span_lint;
+use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
+
+use super::CAST_ENUM_CONSTRUCTOR;
+
+pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>, cast_from: Ty<'_>) {
+    if matches!(cast_from.kind(), ty::FnDef(..))
+        && let ExprKind::Path(path) = &cast_expr.kind
+        && let Res::Def(DefKind::Ctor(CtorOf::Variant, CtorKind::Fn), _) = cx.qpath_res(path, cast_expr.hir_id)
+    {
+        span_lint(
+            cx,
+            CAST_ENUM_CONSTRUCTOR,
+            expr.span,
+            "cast of an enum tuple constructor to an integer",
+        );
+    }
+}

src/tools/clippy/clippy_lints/src/casts/mod.rs

@@ -1,3 +1,4 @@
+mod cast_enum_constructor;
 mod cast_lossless;
 mod cast_possible_truncation;
 mod cast_possible_wrap;
@@ -454,6 +455,24 @@ declare_clippy_lint! {
     "casting using `as` between raw pointers to slices of types with different sizes"
 }
 
+declare_clippy_lint! {
+    /// ### What it does
+    /// Checks for casts from an enum tuple constructor to an integer.
+    ///
+    /// ### Why is this bad?
+    /// The cast is easily confused with casting a c-like enum value to an integer.
+    ///
+    /// ### Example
+    /// ```rust
+    /// enum E { X(i32) };
+    /// let _ = E::X as usize;
+    /// ```
+    #[clippy::version = "1.61.0"]
+    pub CAST_ENUM_CONSTRUCTOR,
+    suspicious,
+    "casts from an enum tuple constructor to an integer"
+}
+
 pub struct Casts {
     msrv: Option<RustcVersion>,
 }
@@ -481,6 +500,7 @@ impl_lint_pass!(Casts => [
     CHAR_LIT_AS_U8,
     PTR_AS_PTR,
     CAST_ENUM_TRUNCATION,
+    CAST_ENUM_CONSTRUCTOR
 ]);
 
 impl<'tcx> LateLintPass<'tcx> for Casts {
@@ -518,6 +538,7 @@ impl<'tcx> LateLintPass<'tcx> for Casts {
                     cast_sign_loss::check(cx, expr, cast_expr, cast_from, cast_to);
                 }
                 cast_lossless::check(cx, expr, cast_expr, cast_from, cast_to, &self.msrv);
+                cast_enum_constructor::check(cx, expr, cast_expr, cast_from);
             }
         }
 

src/tools/clippy/clippy_lints/src/collapsible_if.rs

@@ -42,7 +42,7 @@ declare_clippy_lint! {
     ///
     /// Should be written:
     ///
-    /// ```rust.ignore
+    /// ```rust,ignore
     /// if x && y {
     ///     …
     /// }
@@ -76,7 +76,7 @@ declare_clippy_lint! {
     ///
     /// Should be written:
     ///
-    /// ```rust.ignore
+    /// ```rust,ignore
     /// if x {
     ///     …
     /// } else if y {

src/tools/clippy/clippy_lints/src/doc.rs

@@ -637,12 +637,6 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
                 loop {
                     match parser.parse_item(ForceCollect::No) {
                         Ok(Some(item)) => match &item.kind {
-                            // Tests with one of these items are ignored
-                            ItemKind::Static(..)
-                            | ItemKind::Const(..)
-                            | ItemKind::ExternCrate(..)
-                            | ItemKind::ForeignMod(..) => return false,
-                            // We found a main function ...
                             ItemKind::Fn(box Fn {
                                 sig, body: Some(block), ..
                             }) if item.ident.name == sym::main => {
@@ -661,8 +655,13 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
                                     return false;
                                 }
                             },
-                            // Another function was found; this case is ignored too
-                            ItemKind::Fn(..) => return false,
+                            // Tests with one of these items are ignored
+                            ItemKind::Static(..)
+                            | ItemKind::Const(..)
+                            | ItemKind::ExternCrate(..)
+                            | ItemKind::ForeignMod(..)
+                            // Another function was found; this case is ignored
+                            | ItemKind::Fn(..) => return false,
                             _ => {},
                         },
                         Ok(None) => break,

src/tools/clippy/clippy_lints/src/lib.register_all.rs

@@ -23,6 +23,7 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
     LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
     LintId::of(booleans::LOGIC_BUG),
     LintId::of(booleans::NONMINIMAL_BOOL),
+    LintId::of(casts::CAST_ENUM_CONSTRUCTOR),
     LintId::of(casts::CAST_ENUM_TRUNCATION),
     LintId::of(casts::CAST_REF_TO_MUT),
     LintId::of(casts::CAST_SLICE_DIFFERENT_SIZES),
@@ -166,7 +167,6 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
     LintId::of(methods::ITER_NTH_ZERO),
     LintId::of(methods::ITER_OVEREAGER_CLONED),
     LintId::of(methods::ITER_SKIP_NEXT),
-    LintId::of(methods::ITER_WITH_DRAIN),
     LintId::of(methods::MANUAL_FILTER_MAP),
     LintId::of(methods::MANUAL_FIND_MAP),
     LintId::of(methods::MANUAL_SATURATING_ARITHMETIC),
@@ -182,6 +182,7 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
     LintId::of(methods::OPTION_FILTER_MAP),
     LintId::of(methods::OPTION_MAP_OR_NONE),
     LintId::of(methods::OR_FUN_CALL),
+    LintId::of(methods::OR_THEN_UNWRAP),
     LintId::of(methods::RESULT_MAP_OR_INTO_OPTION),
     LintId::of(methods::SEARCH_IS_SOME),
     LintId::of(methods::SHOULD_IMPLEMENT_TRAIT),
@@ -290,7 +291,6 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
     LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
     LintId::of(transmute::WRONG_TRANSMUTE),
     LintId::of(transmuting_null::TRANSMUTING_NULL),
-    LintId::of(try_err::TRY_ERR),
     LintId::of(types::BORROWED_BOX),
     LintId::of(types::BOX_COLLECTION),
     LintId::of(types::REDUNDANT_ALLOCATION),

src/tools/clippy/clippy_lints/src/lib.register_complexity.rs

@@ -47,6 +47,7 @@ store.register_group(true, "clippy::complexity", Some("clippy_complexity"), vec!
     LintId::of(methods::NEEDLESS_SPLITN),
     LintId::of(methods::OPTION_AS_REF_DEREF),
     LintId::of(methods::OPTION_FILTER_MAP),
+    LintId::of(methods::OR_THEN_UNWRAP),
     LintId::of(methods::SEARCH_IS_SOME),
     LintId::of(methods::SKIP_WHILE_NEXT),
     LintId::of(methods::UNNECESSARY_FILTER_MAP),

src/tools/clippy/clippy_lints/src/lib.register_lints.rs

@@ -70,6 +70,7 @@ store.register_lints(&[
     cargo::REDUNDANT_FEATURE_NAMES,
     cargo::WILDCARD_DEPENDENCIES,
     case_sensitive_file_extension_comparisons::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+    casts::CAST_ENUM_CONSTRUCTOR,
     casts::CAST_ENUM_TRUNCATION,
     casts::CAST_LOSSLESS,
     casts::CAST_POSSIBLE_TRUNCATION,
@@ -319,6 +320,7 @@ store.register_lints(&[
     methods::OPTION_FILTER_MAP,
     methods::OPTION_MAP_OR_NONE,
     methods::OR_FUN_CALL,
+    methods::OR_THEN_UNWRAP,
     methods::RESULT_MAP_OR_INTO_OPTION,
     methods::SEARCH_IS_SOME,
     methods::SHOULD_IMPLEMENT_TRAIT,
@@ -332,6 +334,7 @@ store.register_lints(&[
     methods::UNNECESSARY_FILTER_MAP,
     methods::UNNECESSARY_FIND_MAP,
     methods::UNNECESSARY_FOLD,
+    methods::UNNECESSARY_JOIN,
     methods::UNNECESSARY_LAZY_EVALUATIONS,
     methods::UNNECESSARY_TO_OWNED,
     methods::UNWRAP_OR_ELSE_DEFAULT,

src/tools/clippy/clippy_lints/src/lib.register_nursery.rs

@@ -13,6 +13,7 @@ store.register_group(true, "clippy::nursery", Some("clippy_nursery"), vec![
     LintId::of(future_not_send::FUTURE_NOT_SEND),
     LintId::of(index_refutable_slice::INDEX_REFUTABLE_SLICE),
     LintId::of(let_if_seq::USELESS_LET_IF_SEQ),
+    LintId::of(methods::ITER_WITH_DRAIN),
     LintId::of(missing_const_for_fn::MISSING_CONST_FOR_FN),
     LintId::of(mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL),
     LintId::of(mutex_atomic::MUTEX_ATOMIC),

src/tools/clippy/clippy_lints/src/lib.register_pedantic.rs

@@ -63,6 +63,7 @@ store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), vec![
     LintId::of(methods::IMPLICIT_CLONE),
     LintId::of(methods::INEFFICIENT_TO_STRING),
     LintId::of(methods::MAP_UNWRAP_OR),
+    LintId::of(methods::UNNECESSARY_JOIN),
     LintId::of(misc::FLOAT_CMP),
     LintId::of(misc::USED_UNDERSCORE_BINDING),
     LintId::of(mut_mut::MUT_MUT),

src/tools/clippy/clippy_lints/src/lib.register_perf.rs

@@ -16,7 +16,6 @@ store.register_group(true, "clippy::perf", Some("clippy_perf"), vec![
     LintId::of(methods::EXTEND_WITH_DRAIN),
     LintId::of(methods::ITER_NTH),
     LintId::of(methods::ITER_OVEREAGER_CLONED),
-    LintId::of(methods::ITER_WITH_DRAIN),
     LintId::of(methods::MANUAL_STR_REPEAT),
     LintId::of(methods::OR_FUN_CALL),
     LintId::of(methods::SINGLE_CHAR_PATTERN),

src/tools/clippy/clippy_lints/src/lib.register_restriction.rs

@@ -62,6 +62,7 @@ store.register_group(true, "clippy::restriction", Some("clippy_restriction"), ve
     LintId::of(strings::STRING_SLICE),
     LintId::of(strings::STRING_TO_STRING),
     LintId::of(strings::STR_TO_STRING),
+    LintId::of(try_err::TRY_ERR),
     LintId::of(types::RC_BUFFER),
     LintId::of(types::RC_MUTEX),
     LintId::of(undocumented_unsafe_blocks::UNDOCUMENTED_UNSAFE_BLOCKS),

src/tools/clippy/clippy_lints/src/lib.register_style.rs

@@ -105,7 +105,6 @@ store.register_group(true, "clippy::style", Some("clippy_style"), vec![
     LintId::of(single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS),
     LintId::of(tabs_in_doc_comments::TABS_IN_DOC_COMMENTS),
     LintId::of(to_digit_is_some::TO_DIGIT_IS_SOME),
-    LintId::of(try_err::TRY_ERR),
     LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
     LintId::of(unused_unit::UNUSED_UNIT),
     LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),

src/tools/clippy/clippy_lints/src/lib.register_suspicious.rs

@@ -7,6 +7,7 @@ store.register_group(true, "clippy::suspicious", Some("clippy_suspicious"), vec!
     LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
     LintId::of(await_holding_invalid::AWAIT_HOLDING_LOCK),
     LintId::of(await_holding_invalid::AWAIT_HOLDING_REFCELL_REF),
+    LintId::of(casts::CAST_ENUM_CONSTRUCTOR),
     LintId::of(casts::CAST_ENUM_TRUNCATION),
     LintId::of(eval_order_dependence::EVAL_ORDER_DEPENDENCE),
     LintId::of(float_equality_without_abs::FLOAT_EQUALITY_WITHOUT_ABS),

src/tools/clippy/clippy_lints/src/lib.rs

@@ -23,6 +23,7 @@
 
 // FIXME: switch to something more ergonomic here, once available.
 // (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_arena;
 extern crate rustc_ast;
 extern crate rustc_ast_pretty;
 extern crate rustc_attr;