Move method (#4238)

Source/SwiftLintFramework/Models/SwiftLintFile.swift

@@ -63,31 +63,13 @@ public final class SwiftLintFile {
     func markAsTestFile() {
         isTestFile = true
     }
-
-    /// Returns whether or not the file contains any attributes that require the Foundation module.
-    func containsAttributesRequiringFoundation() -> Bool {
-        guard contents.contains("@objc") else {
-            return false
-        }
-
-        func containsAttributesRequiringFoundation(dict: SourceKittenDictionary) -> Bool {
-            let attributesRequiringFoundation = SwiftDeclarationAttributeKind.attributesRequiringFoundation
-            if !attributesRequiringFoundation.isDisjoint(with: dict.enclosedSwiftAttributes) {
-                return true
-            } else {
-                return dict.substructure.contains(where: containsAttributesRequiringFoundation)
-            }
-        }
-
-        return containsAttributesRequiringFoundation(dict: structureDictionary)
-    }
 }
 
 // MARK: - Hashable Conformance
 
-extension SwiftLintFile: Hashable {
+extension SwiftLintFile: Equatable, Hashable {
     public static func == (lhs: SwiftLintFile, rhs: SwiftLintFile) -> Bool {
-        return lhs.id == rhs.id
+        lhs.id == rhs.id
     }
 
     public func hash(into hasher: inout Hasher) {

Source/SwiftLintFramework/Rules/Lint/UnusedImportRule.swift

@@ -275,4 +275,22 @@ private extension SwiftLintFile {
             }
         }
     }
+
+    /// Returns whether or not the file contains any attributes that require the Foundation module.
+    func containsAttributesRequiringFoundation() -> Bool {
+        guard contents.contains("@objc") else {
+            return false
+        }
+
+        func containsAttributesRequiringFoundation(dict: SourceKittenDictionary) -> Bool {
+            let attributesRequiringFoundation = SwiftDeclarationAttributeKind.attributesRequiringFoundation
+            if !attributesRequiringFoundation.isDisjoint(with: dict.enclosedSwiftAttributes) {
+                return true
+            } else {
+                return dict.substructure.contains(where: containsAttributesRequiringFoundation)
+            }
+        }
+
+        return containsAttributesRequiringFoundation(dict: structureDictionary)
+    }
 }