add test case

Author: liufengyun

tests/pos/i2551/library_1.scala

@@ -0,0 +1,14 @@
+package scala {
+  package meta {
+    package config {
+      case class Version()
+
+      trait Aliases {
+        type Version = scala.meta.config.Version
+        val Version = scala.meta.config.Version
+      }
+    }
+  }
+
+  package object meta extends scala.meta.config.Aliases
+}

tests/pos/i2551/test_2.scala

@@ -0,0 +1,5 @@
+import scala.meta._
+
+object Test {
+  val v = Version()
+}