[clang] [clang-format] Handles Elaborated type specifier for enum in trailing return (PR #80085)

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https://github.com/XDeme created https://github.com/llvm/llvm-project/pull/80085

Fixes llvm/llvm-project#80062

>From 31936e52dd7a14f6f165ea15930f0b9d5c5a8d34 Mon Sep 17 00:00:00 2001
From: XDeme <fernando.tagawa.gamail.com at gmail.com>
Date: Tue, 30 Jan 2024 21:36:04 -0300
Subject: [PATCH] Handle enum elaborated type specifier

---
 clang/lib/Format/UnwrappedLineParser.cpp      | 4 ++--
 clang/unittests/Format/TokenAnnotatorTest.cpp | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index b904e0e56d9eb..57669bc61749e 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -1760,8 +1760,8 @@ void UnwrappedLineParser::parseStructuralElement(
       break;
     }
     case tok::kw_enum:
-      // Ignore if this is part of "template <enum ...".
-      if (Previous && Previous->is(tok::less)) {
+      // Ignore if this is part of "template <enum ..." or "... -> enum".
+      if (Previous && (Previous->is(tok::less) || Previous->is(tok::arrow))) {
         nextToken();
         break;
       }
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index 67678c18963b1..8924583278620 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -2606,6 +2606,12 @@ TEST_F(TokenAnnotatorTest, StreamOperator) {
   EXPECT_TRUE(Tokens[5]->MustBreakBefore);
 }
 
+TEST_F(TokenAnnotatorTest, UnderstandsElaboratedTypeSpecifier) {
+  auto Tokens = annotate("auto foo() -> enum En {}");
+  ASSERT_EQ(Tokens.size(), 10u);
+  EXPECT_TOKEN(Tokens[7], tok::l_brace, TT_FunctionLBrace);
+}
+
 } // namespace
 } // namespace format
 } // namespace clang