mv.visitCode();
mv.visitFieldInsn(Opcodes.GETSTATIC, self_type.getInternalName(),
"compile", ESEQ_TYPE.getDescriptor());
mv.visitInsn(ARETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
// make default constructor
mv = cv.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);