Fix class mistaken for class let

Sources/ParsingHelpers.swift

@@ -358,6 +358,19 @@ extension Formatter {
         }
     }
 
+    /// Returns true if the token at specified index is a modifier
+    func isModifier(at index: Int) -> Bool {
+        guard let token = token(at: index), token.isModifierKeyword else {
+            return false
+        }
+        if token == .keyword("class"),
+           let nextToken = next(.nonSpaceOrCommentOrLinebreak, after: index)
+        {
+            return nextToken.isDeclarationTypeKeyword || nextToken.isModifierKeyword
+        }
+        return true
+    }
+
     /// Returns true if the modifiers list for the given declaration contain a
     /// modifier matching the specified predicate
     func modifiersForDeclaration(at index: Int, contains: (Int, String) -> Bool) -> Bool {

Sources/Rules.swift

@@ -6138,7 +6138,7 @@ public struct _FormatRules {
             }
 
             // Skip modifiers
-            while keyword.isModifierKeyword {
+            while formatter.isModifier(at: keywordIndex) {
                 guard let nextIndex = formatter.index(of: .keyword, after: keywordIndex) else {
                     break
                 }

Tests/RulesTests+Wrapping.swift

@@ -3887,6 +3887,20 @@ class WrappingTests: RulesTests {
         testFormatting(for: input, rule: FormatRules.wrapAttributes, options: options)
     }
 
+    func testClassAttributeNotMistakenForClassLet() {
+        let input = """
+        @objc final class MyClass: NSObject {}
+        let myClass = MyClass()
+        """
+        let output = """
+        @objc
+        final class MyClass: NSObject {}
+        let myClass = MyClass()
+        """
+        let options = FormatOptions(typeAttributes: .prevLine)
+        testFormatting(for: input, output, rule: FormatRules.wrapAttributes, options: options)
+    }
+
     func testClassImportAttributeNotTreatedAsType() {
         let input = """
         @testable import class Framework.Foo