[clang] [clang-format] Handle `&&` in requires clause in requires requires (PR #169207)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-format

Author: owenca (owenca)

<details>
<summary>Changes</summary>

Fixes #<!-- -->152266

---
Full diff: https://github.com/llvm/llvm-project/pull/169207.diff


2 Files Affected:

- (modified) clang/lib/Format/TokenAnnotator.cpp (+4-1) 
- (modified) clang/unittests/Format/TokenAnnotatorTest.cpp (+9) 


``````````diff
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index cb41756c56bf7..19c42c88762fb 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -3129,8 +3129,11 @@ class AnnotatingParser {
 
     // It is very unlikely that we are going to find a pointer or reference type
     // definition on the RHS of an assignment.
-    if (IsExpression && !Contexts.back().CaretFound)
+    if (IsExpression && !Contexts.back().CaretFound &&
+        Line.getFirstNonComment()->isNot(
+            TT_RequiresClauseInARequiresExpression)) {
       return TT_BinaryOperator;
+    }
 
     // Opeartors at class scope are likely pointer or reference members.
     if (!Scopes.empty() && Scopes.back() == ST_Class)
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index 815c79e68dac9..6d769396589ee 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -1391,6 +1391,15 @@ TEST_F(TokenAnnotatorTest, UnderstandsRequiresClausesAndConcepts) {
   ASSERT_EQ(Tokens.size(), 38u) << Tokens;
   EXPECT_TOKEN(Tokens[19], tok::l_brace, TT_RequiresExpressionLBrace);
 
+  Tokens =
+      annotate("template <typename... Ts>\n"
+               "  requires requires {\n"
+               "    requires std::same_as<int, SomeTemplate<void(Ts &&...)>>;\n"
+               "  }\n"
+               "void Foo();");
+  ASSERT_EQ(Tokens.size(), 34u) << Tokens;
+  EXPECT_TOKEN(Tokens[21], tok::ampamp, TT_PointerOrReference);
+
   Tokens =
       annotate("template <class A, class B> concept C ="
                "std::same_as<std::iter_value_t<A>, std::iter_value_t<B>>;");

``````````

</details>


https://github.com/llvm/llvm-project/pull/169207