--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/llvm/test/TableGen/paste-reserved.td	Tue Jun 08 06:07:14 2021 +0900
@@ -0,0 +1,22 @@
+// RUN: not llvm-tblgen -DERROR1 %s 2>&1 | FileCheck --check-prefix=ERROR1 %s
+// RUN: not llvm-tblgen -DERROR2 %s 2>&1 | FileCheck --check-prefix=ERROR2 %s
+
+defvar list1 = ["foo", "bar", "snork"];
+
+// Pasting a list with a reserved word should produce an error.
+
+#ifdef ERROR1
+def list_paste {
+  list<string> the_list = list1 # in;
+}
+// ERROR1: error: Unknown or reserved token when parsing a value
+#endif
+
+
+// Pasting an identifier with a reserved word should produce an error.
+
+#ifdef ERROR2
+def name_paste#in {
+}
+// ERROR2: error: Unknown or reserved token when parsing a value
+#endif