Fixing formatting of certain kinds of ranges of ranges. #2787
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If you had a range of
R
, whereR
is a const-iterable range, then theformatter
would expect its argument to be passed as aconst R&
but the implementation would end up passing anR&
instead (thefmt_ref_view
case fails to compile on master).But we don't need to deduce the range and check that it has the right const-ness, we can just declare it to have the expected type instead. If that type is
const R&
, then that just works.