Fix neg test

Author: odersky

tests/neg-custom-args/captures/boxmap.check

@@ -1,10 +1,9 @@
--- [E007] Type Mismatch Error: boxmap.scala:15:2 -------------------------------
-15 |  () => b[Box[B]]((x: A) => box(f(x)))
-   |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |  Found:    (() => Box[B]) retains b retains f
+-- [E007] Type Mismatch Error: tests/neg-custom-args/captures/boxmap.scala:15:2 ----------------------------------------
+15 |  () => b[Box[B]]((x: A) => box(f(x)))  // error
+   |  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |  Found:    (() => Box[B]) retains b retains f
    |  Required: () => Box[B]
    |
-   |  where:    B is a type in method lazymap with bounds <: Top
+   |  where:    B is a type in method lazymap with bounds <: Top
 
 longer explanation available when compiling with `-explain`
-1 error found

tests/neg-custom-args/captures/boxmap.scala

@@ -11,5 +11,5 @@ def box[T <: Top](x: T): Box[T] =
 def map[A <: Top, B <: Top](b: Box[A])(f: A ==> B): Box[B] =
   b[Box[B]]((x: A) => box(f(x)))
 
-def lazymap[A <: Top, B <: Top](b: Box[A])(f: A ==> B): () => Box[B] =//retains b.type | f.type =
-  () => b[Box[B]]((x: A) => box(f(x)))
+def lazymap[A <: Top, B <: Top](b: Box[A])(f: A ==> B): () => Box[B] =
+  () => b[Box[B]]((x: A) => box(f(x)))  // error