This code:

import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Stream;

public class Bug1 {
    public static void main(String[] args) {
        new Bug1().test();
    }

    public void test() {
        System.out.println(match( a -> true,
                (v) -> {
                    if ("one".equals(v)) return 1;
                    if (v instanceof Number) {
                        Number n = (Number) v;
                        if (n.longValue() == 3) return "three";
                        return n.longValue();
                    }
                    return "";
                }, 2, 3, "one", "two") );
    }

    public <T> T match(Predicate<T> p, Function<T, T> f, T... t) {
        return Stream.of(t).parallel().filter(p).map(f).findAny().get();
    }
}

provokes an assertion error: 

An exception has occurred in the compiler (1.9.0-internal). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport)  after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report.  Thank you.
java.lang.AssertionError: attribution shouldn't be happening here
	at com.sun.tools.javac.util.Assert.error(Assert.java:132)
	at com.sun.tools.javac.util.Assert.check(Assert.java:93)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrNode.process(DeferredAttr.java:594)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrContext.complete(DeferredAttr.java:482)
	at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:198)
	at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:562)
	at com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:599)
	at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3760)
	at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3548)
	at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3455)
	at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3434)
	at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3421)
	at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3159)
	at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2188)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:539)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1769)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1599)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:539)
	at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:389)
	at com.sun.tools.javac.comp.DeferredAttr$2.complete(DeferredAttr.java:283)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:249)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:236)
	at com.sun.tools.javac.comp.Resolve$MethodResultInfo.check(Resolve.java:1002)
	at com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:824)
	at com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:729)
	at com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:833)
	at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:574)
	at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1436)
	at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1623)
	at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1694)
	at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1667)
	at com.sun.tools.javac.comp.Resolve$9.doLookup(Resolve.java:2375)
	at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3031)
	at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3282)
	at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2372)
	at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2366)
	at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3330)
	at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3212)
	at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2070)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:539)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1769)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1599)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:539)
	at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:585)
	at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1537)
	at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1417)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:539)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:605)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:621)
	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1073)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:985)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:539)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:605)
	at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:968)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:837)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:539)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:605)
	at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4282)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4192)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4121)
	at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4096)
	at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1224)
	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:866)
	at com.sun.tools.javac.main.Main.compile(Main.java:249)
	at com.sun.tools.javac.main.Main.compile(Main.java:140)
	at com.sun.tools.javac.Main.compile(Main.java:56)
	at com.sun.tools.javac.Main.main(Main.java:42)

reported by Alex Zuev