ADDITIONAL SYSTEM INFORMATION :
Clear problem in source code

A DESCRIPTION OF THE PROBLEM :
line 39 of Nashorn/src/org.openjdk.nashorn/share/classes/org/openjdk/nashorn/api/tree
/ForOfLoopTreeImpl.java appears to be incorrect, asserting that the node is a for in loop not a for of loop.

REGRESSION : Last worked in version 25

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Try parsing a for .. of loop with asserts enabled

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Successful parse
ACTUAL -
An assert with an incorrect error message no less.