dtcxzyw wrote:

> If I am reading the code correctly there should be some constexpr cases that 
> generate a diagnostic, can we verify that with a test?

It has been tested by the following case:
```
extern int &Recurse1;
int &Recurse2 = Recurse1;
int &Recurse1 = Recurse2;
constexpr int &Recurse3 = Recurse2;
```
Without diagnostic-related code in this patch, we will lose some notes on 
`Recurse2`.


https://github.com/llvm/llvm-project/pull/128409
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