diff --git a/absl/log/internal/BUILD.bazel b/absl/log/internal/BUILD.bazel
index 19243a58..3ddae933 100644
--- a/absl/log/internal/BUILD.bazel
+++ b/absl/log/internal/BUILD.bazel
@@ -230,6 +230,7 @@ cc_library(
     deps = [
         ":config",
         "//absl/base:config",
+        "//absl/base:core_headers",
         "//absl/base:log_severity",
         "//absl/log:log_entry",
         "//absl/strings",
@@ -265,6 +266,7 @@ cc_library(
         ":config",
         ":test_helpers",
         "//absl/base:config",
+        "//absl/base:core_headers",
         "//absl/base:log_severity",
         "//absl/log:log_entry",
         "//absl/strings",
diff --git a/absl/log/internal/test_actions.cc b/absl/log/internal/test_actions.cc
index 41ca9887..c0d04e18 100644
--- a/absl/log/internal/test_actions.cc
+++ b/absl/log/internal/test_actions.cc
@@ -19,9 +19,11 @@
 #include <iostream>
 #include <string>
 
+#include "absl/base/attributes.h"
 #include "absl/base/config.h"
 #include "absl/log/internal/config.h"
 #include "absl/strings/escaping.h"
+#include "absl/strings/str_cat.h"
 #include "absl/strings/string_view.h"
 #include "absl/time/time.h"
 
@@ -30,37 +32,38 @@ ABSL_NAMESPACE_BEGIN
 namespace log_internal {
 
 void WriteToStderrWithFilename::operator()(const absl::LogEntry& entry) const {
-  std::cerr << message << " (file: " << entry.source_filename() << ")"
-            << std::endl;
+  std::cerr << message << " (file: " << entry.source_filename() << ")\n";
 }
 
 void WriteEntryToStderr::operator()(const absl::LogEntry& entry) const {
-  if (!message.empty()) std::cerr << message << std::endl;
+  if (!message.empty()) std::cerr << message << "\n";
 
-  std::cerr << "LogEntry{\n"
-            << "  source_filename: \""
-            << absl::CHexEscape(entry.source_filename()) << "\"\n"
-            << "  source_basename: \""
-            << absl::CHexEscape(entry.source_basename()) << "\"\n"
-            << "  source_line: " << entry.source_line() << "\n"
-            << "  prefix: " << (entry.prefix() ? "true\n" : "false\n")
-            << "  log_severity: " << entry.log_severity() << "\n"
-            << "  timestamp: " << entry.timestamp() << "\n"
-            << "  text_message: \"" << absl::CHexEscape(entry.text_message())
-            << "\"\n  verbosity: " << entry.verbosity() << "\n"
-            << "}" << std::endl;
+  const std::string source_filename = absl::CHexEscape(entry.source_filename());
+  const std::string source_basename = absl::CHexEscape(entry.source_basename());
+  const std::string text_message = absl::CHexEscape(entry.text_message());
+  std::cerr << "LogEntry{\n"                                            //
+            << "  source_filename: \"" << source_filename << "\"\n"     //
+            << "  source_basename: \"" << source_basename << "\"\n"     //
+            << "  source_line: " << entry.source_line() << "\n"         //
+            << "  prefix: " << (entry.prefix() ? "true\n" : "false\n")  //
+            << "  log_severity: " << entry.log_severity() << "\n"       //
+            << "  timestamp: " << entry.timestamp() << "\n"             //
+            << "  text_message: \"" << text_message << "\"\n"           //
+            << "  verbosity: " << entry.verbosity() << "\n"             //
+            << "}\n";
 }
 
 void WriteEntryToStderr::operator()(absl::LogSeverity severity,
                                     absl::string_view filename,
                                     absl::string_view log_message) const {
-  if (!message.empty()) std::cerr << message << std::endl;
-
-  std::cerr << "LogEntry{\n"
-            << "  source_filename: \"" << absl::CHexEscape(filename) << "\"\n"
-            << "  log_severity: " << severity << "\n"
-            << "  text_message: \"" << absl::CHexEscape(log_message) << "}"
-            << std::endl;
+  if (!message.empty()) std::cerr << message << "\n";
+  const std::string source_filename = absl::CHexEscape(filename);
+  const std::string text_message = absl::CHexEscape(log_message);
+  std::cerr << "LogEntry{\n"                                         //
+            << "  source_filename: \"" << source_filename << "\"\n"  //
+            << "  log_severity: " << severity << "\n"                //
+            << "  text_message: \"" << text_message << "\"\n"        //
+            << "}\n";
 }
 
 }  // namespace log_internal
diff --git a/absl/log/internal/test_matchers.cc b/absl/log/internal/test_matchers.cc
index ee32617b..10f4111f 100644
--- a/absl/log/internal/test_matchers.cc
+++ b/absl/log/internal/test_matchers.cc
@@ -17,10 +17,12 @@
 
 #include <sstream>
 #include <string>
+#include <type_traits>
 #include <utility>
 
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
+#include "absl/base/attributes.h"
 #include "absl/base/config.h"
 #include "absl/log/internal/config.h"
 #include "absl/log/internal/test_helpers.h"