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It was proposed in PR112490 to also adjust basic_const_iterator's friend operator-(sent, iter) overload alongside the r15-7757-g4342c50ca84ae5 adjustments to its comparison operators, but we lacked a concrete testcase demonstrating fixable constraint recursion there. It turns out Hewill Kang's PR115046 is such a testcase! So this patch makes the same adjustments to that overload as well, fixing PR115046. The LWG 4218 P/R will need to get adjusted too. PR libstdc++/115046 PR libstdc++/112490 libstdc++-v3/ChangeLog: * include/bits/stl_iterator.h (basic_const_iterator::operator-): Replace non-dependent basic_const_iterator function parameter with a dependent one of type basic_const_iterator<_It2> where _It2 matches _It. * testsuite/std/ranges/adaptors/as_const/1.cc (test04): New test. Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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