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// { dg-do preprocess }
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// { dg-options "-std=gnu99 -fdiagnostics-show-option -trigraphs -Werror=trigraphs" }
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/* { dg-message "some warnings being treated as errors" "" {target "*-*-*"} 0 } */
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??= // { dg-error "trigraph \\?\\?= converted to # .-Werror=trigraphs." }
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