MethodHandles.countedLoop(MH, MH, MH, MH) creates method handle with wrong return type, e.g.
start=()int
end=()int
init=null
body=(int)String
Should result with void method handle (according to countedLoop documentation and generic loop documentation both).
Expected result ()void, actual ()String.

The same situation occurred with MethodHandles.countedLoop(MH, MH, MH) and MethodHandles.iteratedLoop(...).

Example for iteratedLoop - Failures1.java
Example for countedLoop(...) - Failures0.java
Found on jdk9_b116, tests are under development