[clang] [Clang] Static and explicit object member functions with the same parameter-type-lists (PR #93430)

[Hubert Tong via cfe-commits]

================
@@ -5813,6 +5813,27 @@ static TypoCorrection TryTypoCorrectionForCall(Sema &S, Expr *Fn,
   return TypoCorrection();
 }
 
+// [C++26][[expr.unary.op]/p4
+// A pointer to member is only formed when an explicit &
+// is used and its operand is a qualified-id not enclosed in parentheses.
+static bool isParenthetizedAndQualifiedAddressOfExpr(Expr *Fn) {
+  if (!isa<ParenExpr>(Fn))
+    return false;
+
+  Fn = Fn->IgnoreParens();
+
+  auto *UO = dyn_cast<UnaryOperator>(Fn);
+  if (!UO || UO->getOpcode() != clang::UO_AddrOf)
+    return false;
+  if (auto *DRE = dyn_cast<DeclRefExpr>(UO->getSubExpr()->IgnoreParens())) {
+    assert(isa<FunctionDecl>(DRE->getDecl()) && "expected a function");
----------------
hubert-reinterpretcast wrote:

@cor3ntin, this assert is failing for a simple test (https://godbolt.org/z/Ye88sxfo8):
```cpp
int bar(void) { return 55; }
int (&fref)(void) = bar;

int main(void) {
  return (&fref)();
}
```


https://github.com/llvm/llvm-project/pull/93430