Fix docCommentsBeforeModifiers bug

Sources/ParsingHelpers.swift

@@ -404,9 +404,15 @@ extension Formatter {
     func modifiersForDeclaration(at index: Int, contains: (Int, String) -> Bool) -> Bool {
         var index = index
         while var prevIndex = self.index(of: .nonSpaceOrCommentOrLinebreak, before: index) {
-            let token = tokens[prevIndex]
-            switch token {
-            case _ where token.isModifierKeyword || token.isAttribute:
+            switch tokens[prevIndex] {
+            case let token where token.isModifierKeyword || token.isAttribute:
+                if case .identifier = token,
+                   let nextToken = last(.nonSpaceOrCommentOrLinebreak, before: prevIndex),
+                   nextToken == .keyword("case") || nextToken.isOperator(ofType: .infix) || nextToken.isOperator(ofType: .prefix)
+                {
+                    // Part of previous declaration
+                    return false
+                }
                 if contains(prevIndex, token.string) {
                     return true
                 }

Tests/Rules/DocCommentsBeforeModifiersTests.swift

@@ -271,10 +271,37 @@ class DocCommentsBeforeModifiersTests: XCTestCase {
             case prefix(String)
 
             /// A postfix operator
-            case postfix(String)
+            case postfix
+
+            /// Required
+            case required
+
+            /// Optional
+            case optional
+
+            /// Open
+            case open
+
+            /// Other
+            case other
         }
         """
 
         testFormatting(for: input, rule: .docCommentsBeforeModifiers)
     }
+
+    func testDynamicFunctionName() {
+        let input = """
+        enum Colors {
+            /// Tint color
+            static let tintColor = UIColor.dynamic(light: .fullBlack, dark: .white)
+            /// Text color
+            static let textColor = UIColor.dynamic(light: .fullBlack, dark: .white)
+            /// Line color
+            static let lineColor: UIColor = .dynamic(light: .fullBlack, dark: .white)
+        }
+        """
+
+        testFormatting(for: input, rule: .docCommentsBeforeModifiers, exclude: [.propertyTypes])
+    }
 }