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// Assorted macros to help test #include behavior across file boundaries.
#define helper1 0
void helper2(const char *, ...);
#define M1(a, ...) helper2(a, ##__VA_ARGS__);
// Note: M2 stresses vararg macro functions with macro arguments. The spelling
// locations of the args used to be set to the expansion site, leading to
// crashes (region LineEnd < LineStart). The regression test requires M2's line
// number to be greater than the line number containing the expansion.
#define M2(a, ...) M1(a, helper1, ##__VA_ARGS__);
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