compilation error with Clang 3.4

[wojdyr]

What version (or hash if on master) of pybind11 are you using?

2.13.5

Problem description

I suppose Clang 3.4 is not widely used anymore, but just to let you know. I tried building my bindings on an old system with Clang 3.4 and I got:

include/pybind11/detail/type_caster_base.h:260:9: error: 
      return type 'pybind11::handle' must match previous return type 'const pybind11::handle' when
      lambda expression has unspecified explicit return type
        return handle();
        ^

It's this lambda: https://github.com/pybind/pybind11/blob/3fb16ad17587a7ad7fbe18c043e790d68ee7fab4/include/pybind11/detail/type_caster_base.h#L251-L261

After adding -> handle as the return type, the compiler was satisfied and I didn't come across any other problems.

Is this a regression? Put the last known working version here if it is.

must be a regression, but I don't know what was the last working version