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diff --git a/test/tools/llvm-cov/prevent_false_instantiations.h b/test/tools/llvm-cov/prevent_false_instantiations.h
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+// Checks that function instantiations don't go to a wrong file.
+
+// INSTANTIATION-NOT: {{_Z5func[1,2]v}}
+// NAN-NOT: 0{{[ \t]+}}nan%{{[ \t]+}}0{{[ \t]+}}nan%
+
+// RUN: llvm-profdata merge %S/Inputs/prevent_false_instantiations.proftext -o %t.profdata
+// RUN: llvm-cov show -format text %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %t.profdata -filename-equivalence %s | FileCheck %s -check-prefix=INSTANTIATION
+// RUN: llvm-cov report %S/Inputs/prevent_false_instantiations.covmapping -instr-profile %t.profdata | FileCheck %s -check-prefix=NAN
+
+#define DO_SOMETHING() \
+ do { \
+ } while (0)