https://github.com/labath commented:

I don't think this usage of rvalue references is very idiomatic. It saves an 
object copy (move), but:
- that should be very cheap anyway
- it increases the risk of improper handling and weird side-effects -- a 
function like `void use(Error E) {}` will always crash at the closing bracket 
(due to not checking the error), but `use(Error &&E){}` will never crash 
*inside* the function (because it doesn't own the error), and whether the 
program as a whole crashes depends on whether the caller does any other 
operation that would clear the error object.

So, I think it would be better to stick to value semantics. Other than that, 
this seems fine.

https://github.com/llvm/llvm-project/pull/107163
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