     afterMap[tok, default: []].append(tokens)
   }
 
+  /// Enqueues the given list of formatting tokens between each element of the given syntax
+  /// collection (but not before the first one nor after the last one).
   private func insertTokens<Node: SyntaxCollection>(
     _ tokens: Token...,
     betweenElementsOf collectionNode: Node

    }
  }

  private func insertTokens<Node: SyntaxCollection>(
    _ tokens: Token...,
    betweenElementsOf collectionNode: Node

    }
  }

  /// Enqueues the given list of formatting tokens between each element of the given syntax
  /// collection (but not before the first one nor after the last one).
  private func insertTokens<Node: SyntaxCollection>(
    _ tokens: Token...,
    betweenElementsOf collectionNode: Node
