1 files changed, 30 insertions, 0 deletions
diff --git a/clang/test/Preprocessor/macro_vaopt_p1042r1.cpp b/clang/test/Preprocessor/macro_vaopt_p1042r1.cpp
new file mode 100644
index 00000000000..f12dd20b821
--- /dev/null
+++ b/clang/test/Preprocessor/macro_vaopt_p1042r1.cpp
@@ -0,0 +1,30 @@
+ RUN: %clang_cc1 -E %s -pedantic -std=c++2a | FileCheck -strict-whitespace %s
+
+#define LPAREN() (
+#define G(Q) 42
+#define F1(R, X, ...)  __VA_OPT__(G R X) )
+1: int x = F1(LPAREN(), 0, <:-);
+// CHECK: 1: int x = 42;
+
+#define F2(...) f(0 __VA_OPT__(,) __VA_ARGS__)
+#define EMP
+2: F2(EMP)
+// CHECK: 2: f(0 )
+
+#define H3(X, ...) #__VA_OPT__(X##X X##X)
+3: H3(, 0)
+// CHECK: 3: ""
+
+#define H4(X, ...) __VA_OPT__(a X ## X) ## b
+4: H4(, 1)
+// CHECK: 4: a b
+
+#define H4B(X, ...) a ## __VA_OPT__(X ## X b)
+4B: H4B(, 1)
+// CHECK: 4B: a b
+
+#define H5A(...) __VA_OPT__()/**/__VA_OPT__()
+#define H5B(X) a ## X ## b
+#define H5C(X) H5B(X)
+5: H5C(H5A())
+// CHECK: 5: ab