release/20.x: [clang-format] Correctly annotate kw_operator in using decls (#136545)

[llvmbot]

Backport 037657d

Requested by: @owenca

[llvmbot]

@HazardyKnusperkeks What do you think about merging this PR to the release branch?

[llvmbot]

@llvm/pr-subscribers-clang-format

Author: None (llvmbot)

Changes

Backport 037657d

Requested by: @owenca

---

Full diff: https://github.com/llvm/llvm-project/pull/136808.diff

2 Files Affected:

• (modified) clang/lib/Format/TokenAnnotator.cpp (+4-2)
• (modified) clang/unittests/Format/TokenAnnotatorTest.cpp (+5)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 44580d8624684..11b941c5a0411 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -3961,8 +3961,10 @@ void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) const {
   FormatToken *AfterLastAttribute = nullptr;
   FormatToken *ClosingParen = nullptr;
 
-  for (auto *Tok = FirstNonComment ? FirstNonComment->Next : nullptr; Tok;
-       Tok = Tok->Next) {
+  for (auto *Tok = FirstNonComment && FirstNonComment->isNot(tok::kw_using)
+                       ? FirstNonComment->Next
+                       : nullptr;
+       Tok; Tok = Tok->Next) {
     if (Tok->is(TT_StartOfName))
       SeenName = true;
     if (Tok->Previous->EndsCppAttributeGroup)
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index b7b8a21b726b6..757db66c3e298 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -1073,6 +1073,11 @@ TEST_F(TokenAnnotatorTest, UnderstandsOverloadedOperators) {
   ASSERT_EQ(Tokens.size(), 11u) << Tokens;
   EXPECT_TOKEN(Tokens[3], tok::identifier, TT_FunctionDeclarationName);
   EXPECT_TOKEN(Tokens[7], tok::l_paren, TT_OverloadedOperatorLParen);
+
+  Tokens = annotate("using std::operator==;");
+  ASSERT_EQ(Tokens.size(), 7u) << Tokens;
+  // Not TT_FunctionDeclarationName.
+  EXPECT_TOKEN(Tokens[3], tok::kw_operator, TT_Unknown);
 }
 
 TEST_F(TokenAnnotatorTest, OverloadedOperatorInTemplate) {