FULL PRODUCT VERSION :
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)

A DESCRIPTION OF THE PROBLEM :
When compiling the following class:

public class ThrowableParameters {
    public static void main(String[] args) {
        Collections.singletonList(Arrays.asList("a", "b", "c").stream()
                .findAny()
                .orElseThrow(() -> new IllegalArgumentException("?")));
    }
}

the compiler reports an error like this:

src/test/bugs/ThrowableParameters.java:10: error: unreported exception X; must be caught or declared to be thrown
                .orElseThrow(() -> new IllegalArgumentException("?")));
                            ^
  where X,T are type-variables:
    X extends Throwable declared in method <X>orElseThrow(Supplier<? extends X>)
    T extends Object declared in class Optional
1 error

This does not happen if the outer invocation of Collections.singletonList() is removed.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The code should compile without errors.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package test.bugs;

import java.util.Arrays;
import java.util.Collections;

public class ThrowableParameters {
    public static void main(String[] args) {
        Collections.singletonList(Arrays.asList("a", "b", "c").stream()
                .findAny()
                .orElseThrow(() -> new IllegalArgumentException("?")));
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
The parameter to Collections.singletonList() can be first assigned to a local variable.

The orElseThrow() method can have explicit type parameters added, like this:
                 .<IllegalArgumentException> orElseThrow(() -> new IllegalArgumentException("?")));

In both cases the class compiles without errors.