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Paul Hervot authored
In C++14, static constexpr expressions that are odr-used must be declared in the compilation unit at namespace scope even if they are defined and assigned to in the class. The `indices` static constexpr attribute of tuple_automaton_impl was missing that namespace-level declaration, some compiler were fine with it, but clang 8 isn't, unless compiling with -O1 or higher. Fix #216
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