Add test case neg/i19248

Author: Friendseeker

Diff for: tests/neg/i19248/Foo.scala

@@ -0,0 +1,7 @@
+trait Foo { // error
+  class Bar
+
+  type T = Foo.this.Bar
+
+  inline def f: Int = ???
+}

Diff for: tests/neg/i19248/Main.scala

@@ -0,0 +1,3 @@
+@main
+def Main(args: String*): Unit =
+  ()

Diff for: tests/neg/i19248/Scope.scala

@@ -0,0 +1,4 @@
+object Scope {
+}
+object Foo {
+}

Diff for: tests/neg/i19248/empty.scala

@@ -0,0 +1 @@
+