Passing anonymous class instance to vararg method raises ClassCastException

Short test program that exposes the bug:

public class Test {
    void m() {
        f(new Object() { });
    }
    void f(Object... params) {
    }
}

JastAddJ 7.1.1-42-gfcf05c4 Java SE 7 backtrace:

java.lang.AssertionError: Compilation failed when expected to pass:
Errors:
Fatal exception while processing tests/type/anonymousdecl/Test.java:
java.lang.ClassCastException: AST.Opt cannot be cast to AST.List
    at AST.AnonymousDecl.getImplementsListNoTransform(AnonymousDecl.java:521)
    at AST.ClassDecl.Define_TypeDecl_hostType(ClassDecl.java:2088)
    at AST.ASTNode.Define_TypeDecl_hostType(ASTNode.java:1723)
    at AST.BodyDecl.hostType(BodyDecl.java:518)
    at AST.ConstructorDecl.accessibleFrom_compute(ConstructorDecl.java:1099)
    at AST.ConstructorDecl.accessibleFrom(ConstructorDecl.java:1091)
    at AST.Expr.chooseConstructor(Expr.java:199)
    at AST.ClassInstanceExpr.decls_compute(ClassInstanceExpr.java:939)
    at AST.ClassInstanceExpr.decls(ClassInstanceExpr.java:930)
    at AST.ClassInstanceExpr.decl_compute(ClassInstanceExpr.java:970)
    at AST.ClassInstanceExpr.decl(ClassInstanceExpr.java:962)
    at AST.ClassInstanceExpr.transformation(ClassInstanceExpr.java:761)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.MethodAccess.refined_Transformations_MethodAccess_transformation(MethodAccess.java:316)
    at AST.MethodAccess.transformation(MethodAccess.java:832)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.MethodDecl.transformation(MethodDecl.java:554)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.ASTNode.transformation(ASTNode.java:570)
    at AST.TypeDecl.transformation(TypeDecl.java:1392)
    at AST.CompilationUnit.transformation(CompilationUnit.java:249)
    at org.jastadd.jastaddj.JavaCompiler.processNoErrors(JavaCompiler.java:39)
    at AST.Frontend.process(Frontend.java:87)
    at org.jastadd.jastaddj.JavaCompiler.compile(JavaCompiler.java:23)
    at org.jastadd.jastaddj.JavaCompiler.main(JavaCompiler.java:18)

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