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The 23_containers/span/deduction.cc test was already passing, but only because I had previously implemented the original proposed resolution of 3255. As pointed out in 3255 that original P/R was incorrect because it broke construction from array xvalues. This reverts the incorrect part of 3255 (and adds tests for the case it broke), and implements the resolution of 3369 instead. * include/std/span (span(T (&)[N])): Use non-deduced context to prevent first parameter from interfering with class template argument deduction (LWG 3369). * testsuite/23_containers/span/deduction.cc: Add missing 'const'. * testsuite/23_containers/span/lwg3255.cc: Check for construction from rvalues.
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