2 files changed, 19 insertions, 1 deletions
diff --git a/absl/strings/internal/str_format/arg.cc b/absl/strings/internal/str_format/arg.cc
index b0e06bfb..967fe9ca 100644
--- a/absl/strings/internal/str_format/arg.cc
+++ b/absl/strings/internal/str_format/arg.cc
@@ -344,7 +344,7 @@ bool ConvertIntArg(T v, FormatConversionSpecImpl conv, FormatSinkImpl *sink) {
       return ConvertFloatImpl(static_cast<double>(v), conv, sink);
 
     default:
-       ABSL_ASSUME(false);
+      ABSL_ASSUME(false);
   }
 
   if (conv.is_basic()) {
@@ -376,6 +376,15 @@ inline bool ConvertStringArg(string_view v, const FormatConversionSpecImpl conv,
 
 }  // namespace
 
+bool ConvertBoolArg(bool v, FormatSinkImpl *sink) {
+  if (v) {
+    sink->Append("true");
+  } else {
+    sink->Append("false");
+  }
+  return true;
+}
+
 // ==================== Strings ====================
 StringConvertResult FormatConvertImpl(const std::string &v,
                                       const FormatConversionSpecImpl conv,
diff --git a/absl/strings/internal/str_format/arg.h b/absl/strings/internal/str_format/arg.h
index 3c2bb3e6..2dfbf728 100644
--- a/absl/strings/internal/str_format/arg.h
+++ b/absl/strings/internal/str_format/arg.h
@@ -186,6 +186,8 @@ using CharConvertResult = ArgConvertResult<FormatConversionCharSetUnion(
     FormatConversionCharSetInternal::kNumeric,
     FormatConversionCharSetInternal::kStar)>;
 
+bool ConvertBoolArg(bool v, FormatSinkImpl* sink);
+
 // Floats.
 FloatingConvertResult FormatConvertImpl(float v, FormatConversionSpecImpl conv,
                                         FormatSinkImpl* sink);
@@ -234,9 +236,16 @@ IntegralConvertResult FormatConvertImpl(int128 v, FormatConversionSpecImpl conv,
 IntegralConvertResult FormatConvertImpl(uint128 v,
                                         FormatConversionSpecImpl conv,
                                         FormatSinkImpl* sink);
+
+// This function needs to be a template due to ambiguity regarding type
+// conversions.
 template <typename T, enable_if_t<std::is_same<T, bool>::value, int> = 0>
 IntegralConvertResult FormatConvertImpl(T v, FormatConversionSpecImpl conv,
                                         FormatSinkImpl* sink) {
+  if (conv.conversion_char() == FormatConversionCharInternal::v) {
+    return {ConvertBoolArg(v, sink)};
+  }
+
   return FormatConvertImpl(static_cast<int>(v), conv, sink);
 }