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This also fixes a bug in the implementation of LWG 3255, which causes: FAIL: 23_containers/span/lwg3255.cc (test for excess errors) That's because the test was wrong and verified the buggy behaviour. That will be fixed in the following commit. 2019-12-05 JeanHeyd "ThePhD" Meneide <phdofthehouse@gmail.com> Implement P1872R0 and P1394R0 for std::span * include/bits/range_access.h (__adl_begin, __adl_end): Remove. (sentinel_t, range_value_t, range_reference_t) (range_rvalue_reference_t, __forwarding_range, disable_sized_range) (output_range, input_range, forward_range, bidirectional_range) (random_access_range, contiguous_range, common_range): Move here from <ranges>, to make this the "ranges lite" internal header. * include/std/ranges: Move basic aliases and concepts to <bits/range_access.h>. * include/std/span: Use concepts and ranges:: calls instead of enable_if and friends. * include/std/type_traits: Add __is_array_convertible trait. From-SVN: r279000
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