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-rw-r--r--absl/strings/internal/str_format/arg.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/absl/strings/internal/str_format/arg.h b/absl/strings/internal/str_format/arg.h
index 8f79948b..d441e87f 100644
--- a/absl/strings/internal/str_format/arg.h
+++ b/absl/strings/internal/str_format/arg.h
@@ -27,6 +27,8 @@ class FormatSink;
namespace str_format_internal {
+class FormatConversionSpec;
+
template <typename T, typename = void>
struct HasUserDefinedConvert : std::false_type {};