cmtice wrote:
> > Okay, at this I don't think I have any more comments about functionality.
> > The remaining comments are either stylistic (which should be
> > self-explanatory) or about error handling (which I'm going to write about
> > here).
> > For the error handling, I missed the fact that your new implementation
> > throws away the structured diagnostic info after using it to construct the
> > error string. That kinda misses the point, which is to provide the rest of
> > lldb with a structured representation of the error. It looks like the base
> > DiagnosticError is abstract, so for that we need to create our own error
> > subclass of that. I tried to sketch it out in the inline comments (by
> > combining the existing `ExpressionError` class and your code), but this is
> > only a rough sketch -- you'll certainly need to adjust it to make it work.
> > You can tell whether you've succeded by looking at how the new "frame var"
> > error messages are formatted. They should come out in the same was as in
> > the snippet that [Jim
> > posted](https://github.com/llvm/llvm-project/pull/120971#issuecomment-2722987750).
> > The other set of suggested changes is about changing the error
> > representation from Status to llvm::Error. We're basically already using
> > the error object as if it was an llvm::Error, so I think we should just
> > complete the transition and use it throughout the DIL.
>
> I think you've misunderstood the code? I don't just throw away the
> DiagnosticDetail -- its formatted error message, which is what you've been
> asking for, gets passed back into the Status error, which LLDB then prints
> out. So the current implementation is giving the formatted error messages now
> (without any of your further suggested changes):
>
> (lldb) v externGlobalVar error: externGlobalVar ˄ ╰─ error: use of undeclared
> identifier 'externGlobalVar' (lldb) v 'cat + dog' error: cat + dog ˄ ╰─
> error: use of undeclared identifier 'cat' (lldb) v globalVar%%32 error:
> globalVar%%32 ˄ ╰─ error: Unexpected token: <'%' (percent)>
```
(lldb) v externGlobalVar
error: externGlobalVar
˄
╰─ error: use of undeclared identifier 'externGlobalVar'
(lldb) v 'cat + dog'
error: cat + dog
˄
╰─ error: use of undeclared identifier 'cat'
(lldb) v globalVar^32
(int) result = -559038769
(lldb) v globalVar%%32
error: globalVar%%32
˄
╰─ error: Unexpected token: <'%' (percent)>
(lldb)
```
https://github.com/llvm/llvm-project/pull/120971
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