Lambda expression not working in a notebook with `xeus-cpp` `0.10.0`

[Hind-M]

I'm trying to progress with this PR and have the example notebook work properly.
But when trying to run this snippet in a cell, the kernel simply dies without any further information:

xw::slider<double> slider2;

slider2.observe<decltype(slider2)>(
    slider2.value.name(),
        [&](auto& s) {
            std::cout << "The slider current value is " << s.value << std::endl;
        }
);

Note that this works fine when added to test/test_xwidgets.cpp:

For example (this is not pushed yet in the PR as still debugging):

TEST_CASE("slider_observe")
{
    slider<double> s;
    bool observed = false;
    double observed_value = 0.0;

    CHECK_EQ("value", s.value.name());

    s.observe<decltype(s)>(
        s.value.name(),
        [&](auto& w)
        {
            observed = true;
            observed_value = w.value;
        }
    );

    // Initial assignment should trigger observer
    s.value = 5.0;
    CHECK_EQ(true, observed);
    CHECK_EQ(5.0, observed_value);

    // Reset and try again
    observed = false;
    s.value = 10.0;
    CHECK_EQ(true, observed);
    CHECK_EQ(10.0, observed_value);
}

Note that the hack snippet below - explicitly using a std::function wrapping the lambda - is working in the notebook without any crashes or errors:

xw::slider<double> slider2;

slider2.observe(
    slider2.value.name(),
    std::function<void(xw::slider<double>&)>(
        [&](xw::slider<double>& s) {
            std::cout << "The slider current value is " << s.value << std::endl;
        }
    )
);

EDIT: The bug is most likely coming from CppInterOp.

[anutosh491]

Just curious if you could find an example outside of xwidgets with respect to lambdas & captures that don't work in xeus-cpp ?

Would help understand what fails if we have a minimalistic example somehow !