The following program crashes javac 9-ea+149:

===
import java.util.function.Function;

abstract class Test {
  interface A<E> { boolean f(); }
  abstract <R, T> void g(Function<R, T> extractorFunction);
  void h() {
    g((A::f));
  }
}
===

java.lang.NullPointerException
        at jdk.compiler/com.sun.tools.javac.code.Types.skipTypeVars(Types.java:182)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve$UnboundMethodReferenceLookupHelper.<init>(Resolve.java:3235)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve$MethodReferenceLookupHelper.unboundLookup(Resolve.java:3182)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve.resolveMemberReference(Resolve.java:2790)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.visitReference(Attr.java:2887)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMemberReference.accept(JCTree.java:2184)
        at jdk.compiler/com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:501)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:639)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.visitParens(Attr.java:3150)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCParens.accept(JCTree.java:1841)
        at jdk.compiler/com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:501)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:639)
        at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$4.complete(DeferredAttr.java:340)
        at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr$ArgumentType.complete(ArgumentAttr.java:362)
        at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:301)
        at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:287)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve$MethodResultInfo.check(Resolve.java:1036)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:859)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:759)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:868)
        at jdk.compiler/com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:188)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:589)
        at jdk.compiler/com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:628)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3973)