javac throws NPE when compiling the following incorrect code with JDK 9:

public class javacbug {
    public static void main(String[] args) {
        int buf = 0xFFFF;
       int oldBuf = buf;
       if (buf ^ ~oldBuf == 0x10000) {
       }
    }
}

java.lang.NullPointerException
        at com.sun.tools.javac.comp.TransTypes.visitBinary(TransTypes.java:750)
        at com.sun.tools.javac.tree.JCTree$JCBinary.accept(JCTree.java:1947)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:485)
        at com.sun.tools.javac.comp.TransTypes.visitParens(TransTypes.java:722)
        at com.sun.tools.javac.tree.JCTree$JCParens.accept(JCTree.java:1813)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:485)
        at com.sun.tools.javac.comp.TransTypes.visitIf(TransTypes.java:630)
        at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1387)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
        at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:167)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:986)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:485)
        at com.sun.tools.javac.comp.TransTypes.visitMethodDef(TransTypes.java:520)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:838)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
        at com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:139)
        at com.sun.tools.javac.comp.TransTypes.translateClass(TransTypes.java:937)
        at com.sun.tools.javac.comp.TransTypes.visitClassDef(TransTypes.java:506)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:746)
        at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
        at com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:485)
        at com.sun.tools.javac.comp.TransTypes.translateTopLevelClass(TransTypes.java:961)
        at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1446)
        at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1317)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:865)
        at com.sun.tools.javac.main.Main.compile(Main.java:251)
        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)

$ java -version
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b52)
Java HotSpot(TM) 64-Bit Server VM (build 1.9.0-ea-b52, mixed mode)

When compiling the same code with JDK 8u60:

javacbug.java:6: error: bad operand types for binary operator '^'
        if (buf ^ ~oldBuf == 0x10000) {
                ^
  first type: int
  second type: boolean
1 error