Add MSRV for manual_pattern_char_comparison

book/src/lint_configuration.md

@@ -693,6 +693,7 @@ The minimum rust version that the project supports. Defaults to the `rust-versio
 * [`manual_is_ascii_check`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_is_ascii_check)
 * [`manual_let_else`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_let_else)
 * [`manual_non_exhaustive`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_non_exhaustive)
+* [`manual_pattern_char_comparison`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_pattern_char_comparison)
 * [`manual_range_contains`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains)
 * [`manual_rem_euclid`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_rem_euclid)
 * [`manual_retain`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_retain)

clippy_config/src/conf.rs

@@ -265,7 +265,7 @@ define_Conf! {
     ///
     /// Suppress lints whenever the suggested change would cause breakage for other crates.
     (avoid_breaking_exported_api: bool = true),
-    /// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, OPTION_MAP_UNWRAP_OR, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS, ERR_EXPECT, CAST_ABS_TO_UNSIGNED, UNINLINED_FORMAT_ARGS, MANUAL_CLAMP, MANUAL_LET_ELSE, UNCHECKED_DURATION_SUBTRACTION, COLLAPSIBLE_STR_REPLACE, SEEK_FROM_CURRENT, SEEK_REWIND, UNNECESSARY_LAZY_EVALUATIONS, TRANSMUTE_PTR_TO_REF, ALMOST_COMPLETE_RANGE, NEEDLESS_BORROW, DERIVABLE_IMPLS, MANUAL_IS_ASCII_CHECK, MANUAL_REM_EUCLID, MANUAL_RETAIN, TYPE_REPETITION_IN_BOUNDS, TUPLE_ARRAY_CONVERSIONS, MANUAL_TRY_FOLD, MANUAL_HASH_ONE, ITER_KV_MAP, MANUAL_C_STR_LITERALS, ASSIGNING_CLONES, LEGACY_NUMERIC_CONSTANTS.
+    /// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, OPTION_MAP_UNWRAP_OR, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS, ERR_EXPECT, CAST_ABS_TO_UNSIGNED, UNINLINED_FORMAT_ARGS, MANUAL_CLAMP, MANUAL_LET_ELSE, UNCHECKED_DURATION_SUBTRACTION, COLLAPSIBLE_STR_REPLACE, SEEK_FROM_CURRENT, SEEK_REWIND, UNNECESSARY_LAZY_EVALUATIONS, TRANSMUTE_PTR_TO_REF, ALMOST_COMPLETE_RANGE, NEEDLESS_BORROW, DERIVABLE_IMPLS, MANUAL_IS_ASCII_CHECK, MANUAL_REM_EUCLID, MANUAL_RETAIN, TYPE_REPETITION_IN_BOUNDS, TUPLE_ARRAY_CONVERSIONS, MANUAL_TRY_FOLD, MANUAL_HASH_ONE, ITER_KV_MAP, MANUAL_C_STR_LITERALS, ASSIGNING_CLONES, LEGACY_NUMERIC_CONSTANTS, MANUAL_PATTERN_CHAR_COMPARISON.
     ///
     /// The minimum rust version that the project supports. Defaults to the `rust-version` field in `Cargo.toml`
     #[default_text = ""]

clippy_lints/src/lib.rs

@@ -1168,7 +1168,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
             ..Default::default()
         })
     });
-    store.register_late_pass(|_| Box::new(string_patterns::StringPatterns));
+    store.register_late_pass(move |_| Box::new(string_patterns::StringPatterns::new(msrv())));
     // add lints here, do not remove this comment, it's used in `new_lint`
 }
 

clippy_lints/src/string_patterns.rs

@@ -1,5 +1,6 @@
 use std::ops::ControlFlow;
 
+use clippy_config::msrvs::{self, Msrv};
 use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
 use clippy_utils::eager_or_lazy::switch_to_eager_eval;
 use clippy_utils::macros::matching_root_macro_call;
@@ -12,7 +13,7 @@ use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
-use rustc_session::declare_lint_pass;
+use rustc_session::impl_lint_pass;
 use rustc_span::{sym, Span};
 
 declare_clippy_lint! {
@@ -69,7 +70,18 @@ declare_clippy_lint! {
     "using a single-character str where a char could be used, e.g., `_.split(\"x\")`"
 }
 
-declare_lint_pass!(StringPatterns => [MANUAL_PATTERN_CHAR_COMPARISON, SINGLE_CHAR_PATTERN]);
+pub struct StringPatterns {
+    msrv: Msrv,
+}
+
+impl StringPatterns {
+    #[must_use]
+    pub fn new(msrv: Msrv) -> Self {
+        Self { msrv }
+    }
+}
+
+impl_lint_pass!(StringPatterns => [MANUAL_PATTERN_CHAR_COMPARISON, SINGLE_CHAR_PATTERN]);
 
 const PATTERN_METHODS: [(&str, usize); 22] = [
     ("contains", 0),
@@ -122,7 +134,7 @@ fn get_char_span<'tcx>(cx: &'_ LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Optio
     }
 }
 
-fn check_manual_pattern_char_comparison(cx: &LateContext<'_>, method_arg: &Expr<'_>) {
+fn check_manual_pattern_char_comparison(cx: &LateContext<'_>, method_arg: &Expr<'_>, msrv: &Msrv) {
     if let ExprKind::Closure(closure) = method_arg.kind
         && let body = cx.tcx.hir().body(closure.body)
         && let Some(PatKind::Binding(_, binding, ..)) = body.params.first().map(|p| p.pat.kind)
@@ -178,6 +190,9 @@ fn check_manual_pattern_char_comparison(cx: &LateContext<'_>, method_arg: &Expr<
         {
             return;
         }
+        if set_char_spans.len() > 1 && !msrv.meets(msrvs::PATTERN_TRAIT_CHAR_ARRAY) {
+            return;
+        }
         span_lint_and_then(
             cx,
             MANUAL_PATTERN_CHAR_COMPARISON,
@@ -221,7 +236,9 @@ impl<'tcx> LateLintPass<'tcx> for StringPatterns {
         {
             check_single_char_pattern_lint(cx, arg);
 
-            check_manual_pattern_char_comparison(cx, arg);
+            check_manual_pattern_char_comparison(cx, arg, &self.msrv);
         }
     }
+
+    extract_msrv_attr!(LateContext);
 }

tests/ui/manual_pattern_char_comparison.fixed

@@ -47,3 +47,15 @@ fn main() {
     }
     "".find(|c| m!(c));
 }
+
+#[clippy::msrv = "1.57"]
+fn msrv_1_57() {
+    let sentence = "Hello, world!";
+    sentence.trim_end_matches(|c: char| c == '.' || c == ',' || c == '!' || c == '?');
+}
+
+#[clippy::msrv = "1.58"]
+fn msrv_1_58() {
+    let sentence = "Hello, world!";
+    sentence.trim_end_matches(['.', ',', '!', '?']);
+}

tests/ui/manual_pattern_char_comparison.rs

@@ -47,3 +47,15 @@ fn main() {
     }
     "".find(|c| m!(c));
 }
+
+#[clippy::msrv = "1.57"]
+fn msrv_1_57() {
+    let sentence = "Hello, world!";
+    sentence.trim_end_matches(|c: char| c == '.' || c == ',' || c == '!' || c == '?');
+}
+
+#[clippy::msrv = "1.58"]
+fn msrv_1_58() {
+    let sentence = "Hello, world!";
+    sentence.trim_end_matches(|c: char| c == '.' || c == ',' || c == '!' || c == '?');
+}

tests/ui/manual_pattern_char_comparison.stderr

@@ -55,5 +55,11 @@ error: this manual char comparison can be written more succinctly
 LL |     sentence.find(|c| c == '🎈');
    |                   ^^^^^^^^^^^^^ help: consider using a `char`: `'🎈'`
 
-error: aborting due to 9 previous errors
+error: this manual char comparison can be written more succinctly
+  --> tests/ui/manual_pattern_char_comparison.rs:60:31
+   |
+LL |     sentence.trim_end_matches(|c: char| c == '.' || c == ',' || c == '!' || c == '?');
+   |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using an array of `char`: `['.', ',', '!', '?']`
+
+error: aborting due to 10 previous errors