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Calling views::indices(n) should be expression equivalent to views::iota(decltype(n)(0), n), which means it should have the same constraints as views::iota and be SFINAE-friendly. libstdc++-v3/ChangeLog: * include/std/ranges (indices::operator()): Constrain using __can_iota_view concept. * testsuite/std/ranges/indices/1.cc: Check SFINAE-friendliness required by expression equivalence. Replace unused <vector> header with <stddef.h> needed for size_t.
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