hahnjo wrote:

> But my point is that we can't land that if we don't understand what's going 
> wrong without that patch.

We understand that very well and it's described in 
https://reviews.llvm.org/D153003 as well as the surrounding discussions: 
because of the way that `ODRHash` works, template template arguments `A` and 
`B` will hash to different values, even if `using A = B`. However, for template 
specializations, we require them to hash to the same value (with some form of 
normalization) or we won't find nor load the right specializations. That's why 
I said that IMHO `ODRHash` is not the right tool for the job here, which 
follows directly from an old comment of yours: 
https://reviews.llvm.org/D153003#4427412

> An important node here is that ODRHash is used to check the AST Nodes are 
> keeping the same across compilations. There is gap to use ODRHash to check 
> the semantical equality.

(and IIRC that's the same direction that Richard was going)

https://github.com/llvm/llvm-project/pull/76774
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