Don't interleave UexpectedNodes in UnexpectedCodeDeclSyntax

Author: rintaro

CodeGeneration/Sources/SyntaxSupport/CommonNodes.swift

@@ -412,6 +412,7 @@ public let COMMON_NODES: [Node] = [
         // NOTE: This is not .collection() on purpose. We don't need collection related functions for this.
         kind: .node(kind: .unexpectedNodes)
       )
-    ]
+    ],
+    noInterleaveUnexpected: true
   ),
 ]

CodeGeneration/Sources/SyntaxSupport/Node.swift

@@ -127,7 +127,8 @@ public class Node: NodeChoiceConvertible {
     parserFunction: TokenSyntax? = nil,
     traits: [String] = [],
     children: [Child] = [],
-    childHistory: Child.History = []
+    childHistory: Child.History = [],
+    noInterleaveUnexpected: Bool = false
   ) {
     precondition(base != .syntaxCollection)
     precondition(base.isBase, "unknown base kind '\(base)' for node '\(kind)'")
@@ -140,7 +141,7 @@ public class Node: NodeChoiceConvertible {
     self.documentation = SwiftSyntax.Trivia.docCommentTrivia(from: documentation)
     self.parserFunction = parserFunction
 
-    let childrenWithUnexpected = kind.isBase ? children : interleaveUnexpectedChildren(children)
+    let childrenWithUnexpected = (kind.isBase || noInterleaveUnexpected) ? children : interleaveUnexpectedChildren(children)
 
     self.data = .layout(children: childrenWithUnexpected, childHistory: childHistory, traits: traits)
   }