[PATCH] D139705: [clang] fix zero-initialization fix-it for variable template

Thu Mar 23 06:17:14 PDT 2023

erichkeane added a comment.

In D139705#4215653 <https://reviews.llvm.org/D139705#4215653>, @tomasz-kaminski-sonarsource wrote:

> As a downstream, we have concerns with this change. From what I saw it breaks the behavior of the fix-it that wants to remove the whole variable definition (including the initializer). For example, I have unused, that I want to remove variable `x` and unnecessary explicit specialization `temp<double>`:
>
>   template<typename T>
>   T temp = 1;
>   
>   int x  = 10;
>   template<> double temp<double> = 1;
>
> Previously, this could be handled (in case of single variable declaration) by simply removing up the `var->getSourceRange()` with succeeding coma. However, after the change, such code does not work, and in general if `getSourceRange()` is used on `VarDecl` (or even `Decl`), special consideration needs to be taken for the situation when `VarDecl` refers to variable template specialization.
>
> As an alternative, I would suggest introducing an additional function to `VarDecl` (which could be moved up in the hierarchy), that would report a source range that corresponds to //declarator-id//, i.e. for template variable it would include template arguments.

Hmm... I'm being a little dense here I guess, I don't understand what you mean?  Does this result in one of our fixits being wrong here?  With the old range, wouldn't it have left the `<double>` in that case, and now is removing it?  Or what am I missing?

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D139705/new/

https://reviews.llvm.org/D139705