[PATCH] D66349: [clangd] Fix one testcase in XRefsTests.

[Haojian Wu via Phabricator via cfe-commits]

hokein added inline comments.


================
Comment at: clang-tools-extra/clangd/XRefs.cpp:389
     llvm::sort(References, [](const Reference &L, const Reference &R) {
-      return std::tie(L.Loc, L.CanonicalTarget, L.Role) <
-             std::tie(R.Loc, R.CanonicalTarget, R.Role);
+      return L.Loc < R.Loc;
     });
----------------
ilya-biryukov wrote:
> What are the elements `References` for the problematic case?
> 
> If we have duplicate elements, then `sort()` would now give us one of the items. Which exact `Decl` we're gonna end up seeing is not well-defined, i.e. it's non-deterministic.
> What are the elements References for the problematic case?

The testcase is using declarations (see the existing test) -- we will get 3 refs on `using ::fo^o`, each ref has a different decl.  

```
void [[foo]](int);
void [[foo]](double);

namespace ns {
using ::[[fo^o]];
}
```

> If we have duplicate elements, then sort() would now give us one of the items. Which exact Decl we're gonna end up seeing is not well-defined, i.e. it's non-deterministic.

I think we could make it deterministic, but only return one refs, WDYT?




Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D66349/new/

https://reviews.llvm.org/D66349