cff87282f4
As discussed at https://github.com/cplusplus/draft/issues/3534 two std::span constructors specify incorrect conditions for throwing exceptions. This patch makes those constructors have correct noexcept-specifiers that accurately reflect what can actually throw. (span(ContiguousIterator, Sentinel)): Add conditional noexcept. * include/std/span (span(ContiguousIterator, size_type)): Change noexcept to be unconditionally true. * testsuite/23_containers/span/nothrow_cons.cc: New test. From-SVN: r279206
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