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-rw-r--r--libcxx/include/__debug2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcxx/include/__debug b/libcxx/include/__debug
index c1512246bfc..a21f9a89884 100644
--- a/libcxx/include/__debug
+++ b/libcxx/include/__debug
@@ -22,7 +22,7 @@
# include <cstdio>
# include <cstddef>
# ifndef _LIBCPP_ASSERT
-# define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : (_VSTD::printf("%s\n", m), _VSTD::abort()))
+# define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : (_VSTD::fprintf(stderr, "%s\n", m), _VSTD::abort()))
# endif
#endif
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