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-rw-r--r--clang/test/Driver/std.c8
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diff --git a/clang/test/Driver/std.c b/clang/test/Driver/std.c
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+// RUN: %clang -std=c99 -trigraphs -std=gnu99 %s -E -o - | FileCheck -check-prefix=OVERRIDE %s
+// OVERRIDE: ??(??)
+// RUN: %clang -ansi %s -E -o - | FileCheck -check-prefix=ANSI %s
+// ANSI: []
+// RUN: %clang -std=gnu99 -trigraphs %s -E -o - | FileCheck -check-prefix=EXPLICIT %s
+// EXPLICIT: []
+
+??(??)