Fix diagnostic failure if an object return different types for begin() and end()

[lackhole]

Fix compilation error when obj->begin() and obj->end() return different type.

This case is uncommon, but used sometimes. E.g, unbounded std::ranges::iota_view

[pcanal]

This fixes #517

[lackhole]

@pcanal Are the errors caused by the changes?

[pcanal]

Humm ... I did not notice the PR was open against the intended repository.

We need to have the PR done at https://github.com/root-project/root/pulls.
I.e. you will need to reapply this change to the Cling code within the ROOT repository.

Thanks.

[ferdymercury]

Humm ... I did not notice the PR was open against the intended repository.

@pcanal is there a way to disable PRs on this repo? Or to have a phsft-bot 'warning' users that this is a mirror and that PR should be rather done to root ?

[pcanal]

It is okay-ish to have PR against this repo for user that work solely on Cling to provide feedback, however they indeed can not be merged and after verification against the Cling-CI they should be migrated (by us or the user) to a ROOT PR.

[ferdymercury]

Closing here as the user already moved the PR to ROOT: root-project/root#14968