NullPointerException in method type inference

ExtendJ 8.0.1-121-gc55b02b Java SE 8

The following simple test case causes a NullPointerException:

public class Test {
    private static final int i = 0;

    public <T extends Test> T a() {
        return b();
    }

    <T extends Test> T b() {
        return null;
    }

}

Here is part of the stack trace:

java.lang.NullPointerException
        at org.extendj.ast.BodyDecl.hostType(BodyDecl.java:730)
        at org.extendj.ast.FieldDecl.isPublic(FieldDecl.java:570)
        at org.extendj.ast.TypeVariable.toInterface_compute(TypeVariable.java:591)
        at org.extendj.ast.TypeVariable.toInterface(TypeVariable.java:567)
        at org.extendj.ast.GLBTypeFactory.addInterfaces(GLBTypeFactory.java:76)
        at org.extendj.ast.GLBTypeFactory.glb(GLBTypeFactory.java:40)
        at org.extendj.ast.Constraints.resolveSubtypeConstraints(Constraints.java:186)
        at org.extendj.ast.Expr.computeConstraints(Expr.java:257)
        at org.extendj.ast.Expr.inferTypeArguments_compute(Expr.java:1243)
        at org.extendj.ast.Expr.inferTypeArguments(Expr.java:1228)
        at org.extendj.ast.MethodAccess.potentiallyApplicable(MethodAccess.java:1687)
        at org.extendj.ast.MethodAccess.potentiallyApplicable(MethodAccess.java:152)
        at org.extendj.ast.MethodAccess.maxSpecific(MethodAccess.java:570)
        at org.extendj.ast.MethodAccess.decls_compute(MethodAccess.java:1141)
        at org.extendj.ast.MethodAccess.decls(MethodAccess.java:1129)

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