[clang] [Clang] Only non-overloaded dereference expressions are lvalues (PR #93457)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: cor3ntin (cor3ntin)

<details>
<summary>Changes</summary>

Fix a regression introduced by #<!-- -->88740

Fixes #<!-- -->92275

---
Full diff: https://github.com/llvm/llvm-project/pull/93457.diff


2 Files Affected:

- (modified) clang/lib/Sema/SemaOverload.cpp (+1-1) 
- (modified) clang/test/SemaCXX/overloaded-operator.cpp (+11) 


``````````diff
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 0c89fca8d38eb..4b4d4f218fbd9 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -14354,7 +14354,7 @@ Sema::CreateOverloadedUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc,
     if (Fn.isInvalid())
       return ExprError();
     return CXXOperatorCallExpr::Create(Context, Op, Fn.get(), ArgsArray,
-                                       Context.DependentTy, VK, OpLoc,
+                                       Context.DependentTy, VK_PRValue, OpLoc,
                                        CurFPFeatureOverrides());
   }
 
diff --git a/clang/test/SemaCXX/overloaded-operator.cpp b/clang/test/SemaCXX/overloaded-operator.cpp
index cab21d67a002f..0701a96d5d0ce 100644
--- a/clang/test/SemaCXX/overloaded-operator.cpp
+++ b/clang/test/SemaCXX/overloaded-operator.cpp
@@ -691,4 +691,15 @@ template <auto T> A<*T> operator *() { return {}; }
 // expected-error at -1 {{overloaded 'operator*' must have at least one parameter of class or enumeration type}}
 }
 
+namespace GH92275 {
+
+template <auto v>
+struct constant{};
+
+template <auto x>
+auto operator *(constant<x>)
+{ return constant<(*x)>{}; }
+
+}
+
 #endif

``````````

</details>


https://github.com/llvm/llvm-project/pull/93457