Update check file

Author: odersky

tests/neg/named-tuples-3.check

@@ -1,4 +1,7 @@
--- Error: tests/neg/named-tuples-3.scala:7:16 --------------------------------------------------------------------------
+-- [E007] Type Mismatch Error: tests/neg/named-tuples-3.scala:7:16 -----------------------------------------------------
 7 |val p: Person = f  // error
   |                ^
-  |                Malformed NamedTuple: names must be string types, but Int was found.
+  |                Found:    NamedTuple.NamedTuple[(Int, Any), (Int, String)]
+  |                Required: Person
+  |
+  | longer explanation available when compiling with `-explain`