Commit a4194fd3ee6a22e447414dd66c044bd01715b10f changed HEDLEY_STATIC_ASSERT to require gcc >= 6 to use `_Static_assert`, but it seems to work fine as far back as at least gcc 4.6.4, as far as I can tell. I'm just wondering if there is some issue with gcc pre-6 that I'm not immediately seeing? It works even with `-std=c89`. I do see a warning with `-pedantic`, but that also happens with gcc 6. https://godbolt.org/z/6q5j856na https://godbolt.org/z/nKaP41WeP
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