llvm-project/clang/test/Preprocessor/macro_fn_comma_swallow.c

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// Test the GNU comma swallowing extension.
// RUN: clang-cc %s -E | grep 'foo{A, }' &&
// RUN: clang-cc %s -E | grep 'fo2{A,}' &&
// RUN: clang-cc %s -E | grep '{foo}' &&
#define X(Y) foo{A, Y}
X()
#define X2(Y) fo2{A,##Y}
X2()
// should eat the comma.
#define X3(b, ...) {b, ## __VA_ARGS__}
X3(foo)
// RUN: clang-cc %s -E | grep 'AA BB'
// PR3880
#define X4(...) AA , ## __VA_ARGS__ BB
X4()