[llvm] [clang-format] Don't break between string literal operands of << (PR #69871)

[Owen Pan via llvm-commits]

https://github.com/owenca updated https://github.com/llvm/llvm-project/pull/69871

>From fc955bc2730b52093d1e6d2bdd2dbf0400879edf Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Sun, 22 Oct 2023 01:36:17 -0700
Subject: [PATCH] [clang-format] Don't break between string literal operands of
 <<

Fixes #44363.
---
 clang/lib/Format/TokenAnnotator.cpp   | 4 ----
 clang/unittests/Format/FormatTest.cpp | 4 ++++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 7f85f48de2ed2ed..e185afaa2885123 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -5118,10 +5118,6 @@ bool TokenAnnotator::mustBreakBefore(const AnnotatedLine &Line,
     return true;
   if (Left.IsUnterminatedLiteral)
     return true;
-  if (Right.is(tok::lessless) && Right.Next && Left.is(tok::string_literal) &&
-      Right.Next->is(tok::string_literal)) {
-    return true;
-  }
   if (Right.is(TT_RequiresClause)) {
     switch (Style.RequiresClausePosition) {
     case FormatStyle::RCPS_OwnLine:
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 0a87cfc4f1d6af9..0841ea1bcb66fa9 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -26459,6 +26459,10 @@ TEST_F(FormatTest, AllowBreakBeforeNoexceptSpecifier) {
                Style);
 }
 
+TEST_F(FormatTest, StreamOutputOperator) {
+  verifyFormat("std::cout << \"foo\" << \"bar\" << baz;");
+}
+
 } // namespace
 } // namespace test
 } // namespace format