Javac internal error compiling lambdas

[Martin Buchholz]

Hi lambdafolk,

This is a bug report.  Using very recent lambda javac:

$ (cat Lambda.java && echo --- && javac Lambda.java)
public class Lambda {
    public static void main(String[] args) throws Throwable {
        Runnable[] rs = {
            () -> { String x = null; },
            () -> { String x = null; },
        };
    }
}
---
An exception has occurred in the compiler (1.8.0-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.NullPointerException
at com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitVarDef(Flow.java:491)
at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:828)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$AliveAnalyzer.scanStat(Flow.java:409)
at com.sun.tools.javac.comp.Flow$AliveAnalyzer.scanStats(Flow.java:417)
at com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitBlock(Flow.java:501)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:884)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$AliveAnalyzer.scanStat(Flow.java:409)
at com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitLambda(Flow.java:694)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1590)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
at com.sun.tools.javac.tree.TreeScanner.visitNewArray(TreeScanner.java:216)
at com.sun.tools.javac.tree.JCTree$JCNewArray.accept(JCTree.java:1537)
at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
at com.sun.tools.javac.comp.Flow$AliveAnalyzer.analyzeTree(Flow.java:722)
at com.sun.tools.javac.comp.Flow.analyzeLambda(Flow.java:227)
at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2381)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1590)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:603)
at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:621)
at com.sun.tools.javac.comp.Attr.attribExprs(Attr.java:656)
at com.sun.tools.javac.comp.Attr.visitNewArray(Attr.java:2238)
at com.sun.tools.javac.tree.JCTree$JCNewArray.accept(JCTree.java:1537)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:603)
at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:621)
at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1083)
at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:828)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:603)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:648)
at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:664)
at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1121)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:884)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:603)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:648)
at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1023)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:771)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:603)
at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:648)
at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4169)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4077)
at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4011)
at com.sun.tools.javac.comp.Attr.attrib(Attr.java:3985)
at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1256)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:909)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:868)
at com.sun.tools.javac.main.Main.compile(Main.java:516)
at com.sun.tools.javac.main.Main.compile(Main.java:376)
at com.sun.tools.javac.main.Main.compile(Main.java:365)
at com.sun.tools.javac.main.Main.compile(Main.java:356)
at com.sun.tools.javac.Main.compile(Main.java:77)
at com.sun.tools.javac.Main.main(Main.java:62)
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