This test exercises extract on a variadic function.
It is a regression test for bug #63287 in which
the final parameter's "..." would go missing.

-- go.mod --
module example.com
go 1.18

-- a/a.go --
package a

//@codeaction(block, "refactor.extract.function", edit=out)

func _() {
	var logf func(string, ...any)
	{ println(logf) } //@loc(block, re`{[^}]*}`)
}

-- @out/a/a.go --
@@ -7 +7,5 @@
-	{ println(logf) } //@loc(block, re`{[^}]*}`)
+	{ newFunction(logf) } //@loc(block, re`{[^}]*}`)
+}
+
+func newFunction(logf func(string, ...any)) {
+	println(logf)
