Allow © in copyright notices

crates/ruff_linter/src/rules/flake8_copyright/mod.rs

@@ -29,6 +29,20 @@ import os
             r"
 # Copyright (C) 2023
 
+import os
+"
+            .trim(),
+            &settings::LinterSettings::for_rules(vec![Rule::MissingCopyrightNotice]),
+        );
+        assert_messages!(diagnostics);
+    }
+
+    #[test]
+    fn notice_with_unicode_c() {
+        let diagnostics = test_snippet(
+            r"
+# Copyright © 2023
+
 import os
 "
             .trim(),

crates/ruff_linter/src/rules/flake8_copyright/settings.rs

@@ -15,7 +15,7 @@ pub struct Settings {
 }
 
 pub static COPYRIGHT: Lazy<Regex> =
-    Lazy::new(|| Regex::new(r"(?i)Copyright\s+(\(C\)\s+)?\d{4}(-\d{4})*").unwrap());
+    Lazy::new(|| Regex::new(r"(?i)Copyright\s+((?:\(C\)|©)\s+)?\d{4}(-\d{4})*").unwrap());
 
 impl Default for Settings {
     fn default() -> Self {

crates/ruff_linter/src/rules/flake8_copyright/snapshots/ruff_linter__rules__flake8_copyright__tests__notice_with_unicode_c.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff_linter/src/rules/flake8_copyright/mod.rs
+---
+