[llvm-bugs] [Bug 31222] New: Produce warning when a derived class shadows a field of the base class with `-Wshadow`

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31222

            Bug ID: 31222
           Summary: Produce warning when a derived class shadows a field
                    of the base class with `-Wshadow`
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: vittorio.romeo at outlook.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

struct Base { int a; };
struct Derived : Base  { int a; };
int main() { }

The code snippet above produces no warnings with `-Wshadow` enabled. 
This seems like an unusual situation that could lead to unexpected behavior.

I suggest producing a warning when `-Wshadow` is enabled, to alert that
`Derived::a` is shadowing `Base::a`.

Related SO question:
https://stackoverflow.com/questions/40908402

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