[PATCH] D146178: [Clang][Sema] Fix comparison of constraint expressions

[Alexander Shaposhnikov via Phabricator via cfe-commits]

alexander-shaposhnikov added inline comments.


================
Comment at: clang/lib/Sema/SemaConcept.cpp:773
+  // ConstrExpr for the inner template will properly adjust the depths.
+  if (isa<CXXRecordDecl>(ND) && isa<CXXRecordDecl>(OtherND))
+    ForConstraintInstantiation = true;
----------------
erichkeane wrote:
> Hmm... this seems really strange to have to do. `ForConstraintInstantiation` shouldn't be used here, the point of that is to make sure we 'keep looking upward' once we hit a spot we normally stop with.  What exactly is the issue that you end up running into here?  Perhaps I can spend some time debugging what we should really be doign.
yeah, I agree. I haven't found a proper solution or at least a better workaround (but would be happy to).
This kicks in for the case 

```
template <class T0>
concept Constraint = true;


template<Constraint T1>
struct Iterator {
    template <Constraint T2>
    friend class Iterator;
    void operator*();
};

Iterator<char*> I2;
```


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D146178/new/

https://reviews.llvm.org/D146178