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diff --git a/clang/test/Frontend/unknown-arg.c b/clang/test/Frontend/unknown-arg.c
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+// RUN: not %clang_cc1 %s -E --helium 2>&1 | \
+// RUN: FileCheck %s
+// RUN: not %clang_cc1 %s -E --hel[ 2>&1 | \
+// RUN: FileCheck %s --check-prefix=DID-YOU-MEAN
+// RUN: not %clang %s -E -Xclang --hel[ 2>&1 | \
+// RUN: FileCheck %s --check-prefix=DID-YOU-MEAN
+
+// CHECK: error: unknown argument: '--helium'
+// DID-YOU-MEAN: error: unknown argument '--hel[', did you mean '--help'?
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