Fix test and and check file

Author: odersky

tests/neg/i8632.check

@@ -0,0 +1,4 @@
+-- [E008] Not Found Error: tests/neg/i8632.scala:2:15 ------------------------------------------------------------------
+2 |  Nil.toString.foo(1) // error
+  |  ^^^^^^^^^^^^^^^^
+  |  value foo is not a member of String

tests/neg/i8632.scala

@@ -1,3 +1,3 @@
 object Test {
-  Nil.toString.foo(1)
+  Nil.toString.foo(1) // error
 }