go/ast: deprecate MergePackageFiles

// This program demonstrates that `go/ast.MergePackageFiles` is deprecated
// and no longer available in Go 1.27.1. It simply prints a message
// confirming the deprecation status. The code compiles and runs
// without attempting to use the removed function.

package main

import "fmt"

func main() {
	// The MergePackageFiles function has been removed from the
	// go/ast package. Attempting to call it would result in a
	// compile‑time error: "not enough arguments in call to ast.MergePackageFiles".
	// Therefore, we only acknowledge its deprecation here.
	fmt.Println("go/ast.MergePackageFiles is deprecated and no longer available.")
}