YT: Removed extra trailing comma in std::tuple formatting

commit_hash:19b37bd3d7e3b4d80e4844676c881bbef1fec76b

2 files changed, 8 insertions, 1 deletions

diff --git a/library/cpp/yt/string/format-inl.h b/library/cpp/yt/string/format-inl.h
index e90d68bfe1..b18c435cb8 100644
--- a/library/cpp/yt/string/format-inl.h
+++ b/library/cpp/yt/string/format-inl.h
@@ -722,7 +722,7 @@ void FormatValue(TStringBuilderBase* builder, const std::tuple<Ts...>& value, TS
     [&] <size_t... Idx> (std::index_sequence<Idx...>) {
         ([&] {
             FormatValue(builder, std::get<Idx>(value), spec);
-            if constexpr (Idx != sizeof...(Ts)) {
+            if constexpr (Idx != sizeof...(Ts) - 1) {
                 builder->AppendString(TStringBuf(", "));
             }
         } (), ...);
diff --git a/library/cpp/yt/string/unittests/format_ut.cpp b/library/cpp/yt/string/unittests/format_ut.cpp
index 8aca8c8e29..e6b5eb7cfe 100644
--- a/library/cpp/yt/string/unittests/format_ut.cpp
+++ b/library/cpp/yt/string/unittests/format_ut.cpp
@@ -239,6 +239,13 @@ TEST(TFormatTest, Pointers)
     }
 }
 
+TEST(TFormatTest, Tuples)
+{
+    EXPECT_EQ("{}", Format("%v", std::tuple()));
+    EXPECT_EQ("{1, 2, 3}", Format("%v", std::tuple(1, 2, 3)));
+    EXPECT_EQ("{1, 2}", Format("%v", std::pair(1, 2)));
+}
+
 TEST(TFormatTest, LazyMultiValueFormatter)
 {
     int i = 1;