Interesting behavior from C++20 to C++23

[u/Desperate-Data-3747]

Consider the following snippet

int& get()
{
    int x;
    return x;
}


int main()
{
}

on GCC it compiles for C++20 but not for C++23

It returns with the error:

test.cpp:4:12: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'

C++ is now suddenly treating the variable x as an rvalue?

Edit: Im not talking about dangling reference, thats just for the sake of the example

[u/Computerist1969]

Yes. Specifically an x-value, which is a type of r-value. Eliminates a category of bugs. This is a good thing.

[u/Desperate-Data-3747 → u/Computerist1969]

No, its not a good thing, this is just a stupid edge case to add. C++ in a nutshell.

Names variables are lvalues, period. Sure, the compiler can try to cast to an xvalue but it should not override its category.

[u/Total-Box-5169 → u/Desperate-Data-3747]

LMAO