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-rw-r--r--test/CXX/modules-ts/dcl.dcl/dcl.module/p2.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/test/CXX/modules-ts/dcl.dcl/dcl.module/p2.cpp b/test/CXX/modules-ts/dcl.dcl/dcl.module/p2.cpp
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index 0000000000000..992715e6b1021
--- /dev/null
+++ b/test/CXX/modules-ts/dcl.dcl/dcl.module/p2.cpp
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -fmodules-ts -verify %s
+
+// A named module shall contain exactly one module interface unit.
+module M; // expected-error {{definition of module 'M' is not available; use -fmodule-file= to specify path to precompiled module interface}}
+
+// FIXME: How do we ensure there is not more than one?