it looks like some old code was hanging around that tried to substitute generic type parameters by name. This is unnecessary because we already have a substituted type at this point, and the type variable we were substituting had no relationship at all with the parameter. After removing the code, all tests seem to be passing.
R=brianwilkerson@google.com
Review URL: https://codereview.chromium.org/1409143009 .
John Messerly
396ed51cf0