[clang] [clang][dataflow] Model assignment to derived class from base. (PR #85064)

[Gábor Horváth via cfe-commits]

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@@ -212,8 +212,23 @@ TEST(TransferTest, CopyRecordFromDerivedToBase) {
       // [[p]]
     }
   )";
+  auto SyntheticFieldCallback = [](QualType Ty) -> llvm::StringMap<QualType> {
+    CXXRecordDecl *ADecl = nullptr;
+    if (Ty.getAsString() == "A")
+      ADecl = Ty->getAsCXXRecordDecl();
+    else if (Ty.getAsString() == "B")
+      ADecl = Ty->getAsCXXRecordDecl()
+                  ->bases_begin()
+                  ->getType()
+                  ->getAsCXXRecordDecl();
+    else
+      return {};
+    QualType IntTy = getFieldNamed(ADecl, "i")->getType();
+    return {{"synth_int", IntTy}};
+  };
+  // Copy derived to base class.
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Xazax-hun wrote:

Ah, OK, I see! Thanks, I somehow expected the behavior to be present in the code as well. Makes sense. 

https://github.com/llvm/llvm-project/pull/85064