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/*
 * @test
 * @bug     6852595
 * @summary Accessing scope using JSR199 API on erroneous tree causes Illegal Argument Exception
 * @author  mcimadamore
 * @modules jdk.compiler/com.sun.tools.javac.tree
 */

import java.io.IOException;
import java.net.URI;
import java.util.Arrays;
import java.util.List;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.ToolProvider;

import com.sun.source.util.JavacTask;
import com.sun.source.tree.*;
import com.sun.source.util.TreePath;
import com.sun.source.util.Trees;
import com.sun.tools.javac.tree.JCTree.*;

public class T6852595 {
    public static void main(String[] args) throws IOException {
        JavaFileObject sfo =
                SimpleJavaFileObject.forSource(URI.create("myfo:/Test.java"),
                                               "class BadName { Object o = j; }");
        List<? extends JavaFileObject> files = Arrays.asList(sfo);
        JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
        JavacTask ct = (JavacTask)tool.getTask(null, null, null, null, null, files);
        Iterable<? extends CompilationUnitTree> compUnits = ct.parse();
        CompilationUnitTree cu = compUnits.iterator().next();
        ClassTree cdef = (ClassTree)cu.getTypeDecls().get(0);
        JCVariableDecl vdef = (JCVariableDecl)cdef.getMembers().get(0);
        TreePath path = TreePath.getPath(cu, vdef.init);
        Trees.instance(ct).getScope(path);
    }
}
