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// This should warn by default.
// RUN: clang-cc %s 2>&1 | grep "warning:" &&
// This should not emit anything.
// RUN: clang-cc %s -w 2>&1 | not grep diagnostic &&
// RUN: clang-cc %s -Wno-#warnings 2>&1 | not grep diagnostic &&
// -Werror can map all warnings to error.
// RUN: clang-cc %s -Werror 2>&1 | grep "error:" &&
// -Werror can map this one warning to error.
// RUN: clang-cc %s -Werror=#warnings 2>&1 | grep "error:" &&
// -Wno-error= overrides -Werror. rdar://3158301
// RUN: clang-cc %s -Werror -Wno-error=#warnings 2>&1 | grep "warning:"
#warning foo
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