Add new variable_shadowing rule (#6568)

Co-authored-by: Danny Mösch <danny.moesch@icloud.com>

Author: nadeemnali

.swiftlint.yml

@@ -50,6 +50,7 @@ disabled_rules:
   - todo
   - trailing_closure
   - type_contents_order
+  - variable_shadowing
   - vertical_whitespace_between_cases
 
 # Configurations

CHANGELOG.md

@@ -52,6 +52,11 @@
   [kapitoshka438](https://github.com/kapitoshka438)
   [#6045](https://github.com/realm/SwiftLint/issues/6045)
 
+* Add `variable_shadowing` rule that flags when a variable declaration shadows
+  an identifier from an outer scope.  
+  [nadeemnali](https://github.com/nadeemnali)
+  [#6228](https://github.com/realm/SwiftLint/issues/6228)
+
 ### Bug Fixes
 
 * Detect and autocorrect missing whitespace before `else` in `guard`

Source/SwiftLintBuiltInRules/Models/BuiltInRules.swift

@@ -240,6 +240,7 @@ public let builtInRules: [any Rule.Type] = [
     UnusedParameterRule.self,
     UnusedSetterValueRule.self,
     ValidIBInspectableRule.self,
+    VariableShadowingRule.self,
     VerticalParameterAlignmentOnCallRule.self,
     VerticalParameterAlignmentRule.self,
     VerticalWhitespaceBetweenCasesRule.self,