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-rw-r--r--test/format-test.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/format-test.cc b/test/format-test.cc
index c995ff69..8ed524cc 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -2439,6 +2439,8 @@ struct custom_char {
operator int() const { return value; }
};
+int to_ascii(custom_char c) { return c; }
+
FMT_BEGIN_NAMESPACE
template <> struct is_char<custom_char> : std::true_type {};
FMT_END_NAMESPACE