Index: include/clang/AST/Expr.h
===================================================================
--- include/clang/AST/Expr.h
+++ include/clang/AST/Expr.h
@@ -2850,6 +2850,15 @@
     return const_cast<CastExpr *>(this)->getSubExprAsWritten();
   }
 
+  /// There are two global types of casts - implicit and explicit.
+  /// The Explicit cast is something that was directly written in the source
+  /// code. And the implicit cast is expected to be the opposite.
+  /// But in AST, some explicit casts are represented as ExplicitCastExpr plus
+  /// one or more immediate ImplicitCastExpr (i.e. with nothing inbetween).
+  /// This function returns false if this cast is either an ExplicitCastExpr
+  /// itself, or it is a part of the ExplicitCastExpr group.
+  bool isActuallyImplicitCast() const;
+
   /// If this cast applies a user-defined conversion, retrieve the conversion
   /// function that it invokes.
   NamedDecl *getConversionFunction() const;
@@ -3011,6 +3020,14 @@
   }
 };
 
+inline bool CastExpr::isActuallyImplicitCast() const {
+  // If this is an Implicit cast, is it *NOT* a part of Explicit cast group?
+  if (auto *IC = dyn_cast<ImplicitCastExpr>(this))
+    return !IC->getIsPartOfExplicitCast();
+  assert(isa<ExplicitCastExpr>(this) && "it has to be Explicit cast then.");
+  return false; // Explicit cast is clearly not an Implicit cast.
+}
+
 /// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style
 /// cast in C++ (C++ [expr.cast]), which uses the syntax
 /// (Type)expr. For example: @c (int)f.