[llvm-bugs] [Bug 90852] clang should warn the use of statement expression which is a GNU extension

[LLVM Bugs via llvm-bugs]

Issue	90852
Summary	clang should warn the use of statement _expression_ which is a GNU extension
Labels	good first issue, clang:diagnostics
Assignees
Reporter	usx95

    ```cpp
struct Printy {
    Printy(int);
    Printy(const Printy&);
 ~Printy();
};

void Foo() {
    Printy P[] = {Printy(1), ({
 int x = 2;
                      Printy p(x);
 p;
                  })};
}
```
This contains statement-_expression_ which is a GNU extension. Clang should warn against the use of this non-standard extension.

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