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Richard Smith proposed adding a synonym for __is_same_as, to accomodate the convention of exposing std::SOME_TRAIT<A, B>::value as __SOME_TRAIT(A, B). So add that alias, and also adjust the C++ printer. I didn't bother changing the RID_ identifier. * c-common.c: Add __is_same, an alias for __is_same_as. * cxx-pretty-print.c (pp_cxx_trait_expression) <case CPTK_IS_SAME_AS>: Print "__is_same". * g++.dg/ext/is_same.C: New test. From-SVN: r279018
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