avoid MSC warning C4702: unreachable code#4822
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if FMT_CONSTEXPR is resolved to constexpr MSC warns about dead code after 'return' instruction. Explicitly using 'else' in these cases avoids the warning.
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if FMT_CONSTEXPR is resolved to constexpr MSC warns about dead code after 'return' instruction. Explicitly using 'else' in these cases avoids the warning.