FULL PRODUCT VERSION :
javac -version
javac 1.8.0_60


ADDITIONAL OS VERSION INFORMATION :
Linux desktop 4.1.6-1-ARCH #1 SMP PREEMPT Mon Aug 17 08:52:28 CEST 2015 x86_64 GNU/Linux
Linux lab 3.13.0-63-generic #103-Ubuntu SMP Fri Aug 14 21:43:30 UTC 2015 i686 i686 i686 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
The attached code does not compile. It should. It did at least in 1.8.0_25


REGRESSION. Last worked in version 8u40

ADDITIONAL REGRESSION INFORMATION:
This code compiled and worked fine in 1.8.0_25


ERROR MESSAGES/STACK TRACES THAT OCCUR :
Error:(15, 20) java: method unmodifiableList in class java.util.Collections cannot be applied to given types;
  required: java.util.List<? extends T>
  found: java.util.Collection<Main>
  reason: cannot infer type-variable(s) E
    (actual and formal argument lists differ in length)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.stream.Collectors;

class Main {

    static Collection<Main> list = null;

    public static void main(String[] args) {
        Collections.unmodifiableList(list.stream().collect(Collectors.toCollection(ArrayList::new)));
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.stream.Collectors;

class Main {

    static Collection<Main> list = null;

    static ArrayList create() {
        return new ArrayList();
    }

    public static void main(String[] args) {
        Collections.unmodifiableList(list.stream().collect(Collectors.toCollection(Main::create)));
    }
}