FULL PRODUCT VERSION :
java version "1.8.0_40-ea"
Java(TM) SE Runtime Environment (build 1.8.0_40-ea-b19)
Java HotSpot(TM) 64-Bit Server VM (build 25.40-b23, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Mac OS Yosemite 10.10.1 (14B25)

A DESCRIPTION OF THE PROBLEM :
Assertion fails in javac when I try to compile my class (see stacktrace below). Code sample is attached.

ADDITIONAL REGRESSION INFORMATION: 
Yes, it worked in some previous java 8 release, but I don't remember which one.
Assertion fails in 8u40 early access preview.
It produces another exception (NullPointerException) in latest stable release (8u25)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute "javac Main.java"

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Succesful compilation
ACTUAL -
Assertion failed in javac

ERROR MESSAGES/STACK TRACES THAT OCCUR :
An exception has occurred in the compiler (1.8.0_40-ea). 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:133)
	at com.sun.tools.javac.util.Assert.check(Assert.java:94)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrNode.process(DeferredAttr.java:591)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredAttrContext.complete(DeferredAttr.java:479)
	at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:182)
	at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:567)
	at com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:604)
	at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3797)
	at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3584)
	at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3491)
	at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3470)
	at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3457)
	at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3201)
	at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2011)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1806)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
	at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:386)
	at com.sun.tools.javac.comp.DeferredAttr$2.complete(DeferredAttr.java:279)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:245)
	at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:232)
	at com.sun.tools.javac.comp.Resolve$MethodResultInfo.check(Resolve.java:1003)
	at com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:829)
	at com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:734)
	at com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:838)
	at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:579)
	at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1441)
	at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1628)
	at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1699)
	at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1672)
	at com.sun.tools.javac.comp.Resolve.findFun(Resolve.java:1832)
	at com.sun.tools.javac.comp.Resolve$8.doLookup(Resolve.java:2393)
	at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3084)
	at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3335)
	at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3320)
	at com.sun.tools.javac.comp.Resolve.resolveMethod(Resolve.java:2389)
	at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3134)
	at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2011)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1806)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
	at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:608)
	at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1056)
	at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:852)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:651)
	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1105)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
	at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:994)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566)
	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635)
	at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4330)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4240)
	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4169)
	at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4144)
	at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1248)
	at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)
	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
	at com.sun.tools.javac.main.Main.compile(Main.java:523)
	at com.sun.tools.javac.main.Main.compile(Main.java:381)
	at com.sun.tools.javac.main.Main.compile(Main.java:370)
	at com.sun.tools.javac.main.Main.compile(Main.java:361)
	at com.sun.tools.javac.Main.compile(Main.java:56)
	at com.sun.tools.javac.Main.main(Main.java:42)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class Main {
    public static class Spectrum {
        public double[] getEnergy() {
            return new double[0];
        }
    }

    protected Spectrum spectrum;

    public static class Ref<T> {
        T value;

        public Ref() {
        }

        public Ref(T value) {
            this.value = value;
        }

        public boolean isNull() {
            return value == null;
        }

        public T get() {
            return value;
        }

        public void set(T value) {
            this.value = value;
        }
    }

    public static <T>T maxKey(Stream<T> stream, Function<T, Double> function) {
        Ref<Double> max = new Ref<>();
        Ref<T> index = new Ref<>();
        stream.forEach(v -> {
            Double value = function.apply(v);

            if (max.isNull() || value > max.get()) {
                max.set(value);
                index.set(v);
            }
        });

        return index.get();
    }

    public static int interpolate(int x, int x0, int x1, int y0, int y1) {
        return y0 + (x - x0) * (y1 - y0) / (x1 - x0);
    }

    public static double interpolate(double x, double x0, double x1, double y0, double y1) {
        return y0 + (x - x0) * (y1 - y0) / (x1 - x0);
    }

    protected int getXByFrequency(double frequency) {
        Insets insets = null;
        return (int) Math.round(interpolate(frequency, getMinSpectrumCoord(), getMaxSpectrumCoord(), insets.left, getWidth() - insets.right));
    }

    private int getWidth() {
        return 0;
    }

    private double getMaxSpectrumCoord() {
        return 0;
    }

    private double getMinSpectrumCoord() {
        return 0;
    }

    void foo() {
        int maxBpmIndex = 0;
        int xcur = getXByFrequency(maxKey(IntStream.range(0, maxBpmIndex).boxed(), i -> Math.abs(spectrum.getEnergy()[i])));
    }
}

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