Issue 952

[CaseyCarter]

No description provided.

[CaseyCarter]

This fixes the symptom - the manifestation in #952, but not the root cause. Removing the exception specifications from range_access::begin_cursor, the view_adaptor::begin_cursor overloads, and view_adaptor::begin_cursor_ also corrects the hard error in #952. Either something is misconstrained in the view_adaptor machinery, or all three compilers are evaluating the exception specifications earlier than they are allowed to.

[CaseyCarter]

Either something is misconstrained in the view_adaptor machinery

There's an instantiation order dependency: changing the return type of view_adaptor::begin_cursor from adaptor_cursor_t<D> to decltype(adaptor_cursor_t<D>{}) brings the hard error back even with the exception specifications disabled. I'm tempted to simply remove the exception specifications and call it fixed.

[CaseyCarter]

I'm going to merge this, and continue investigating the view_adaptor weirdness as a separate issue.

[ericniebler]

Thanks for this!