[PATCH] D79496: [clangd] Fix AddUsing tweak for out-of-line functions.

[Adam Czachorowski via Phabricator via cfe-commits]

adamcz marked an inline comment as done.
adamcz added inline comments.


================
Comment at: clang-tools-extra/clangd/unittests/TweakTests.cpp:2673
+void foo::fun() {
+  one::two::f^f();
+})cpp",
----------------
hokein wrote:
> IIUC, before this patch, the using was added inside the above namespace `foo`, the code was still valid after applying the tweak.
> 
> There is no enclosing namespace for `foo::fun()`, so we will insert the using at the first top-level decl. It seems that we will break the code if the `one::two::ff` decl is defined in the main file (not the `test.hpp`), e.g.
> 
> ```
> // using one::two::ff will be inserted here, which is not valid
> namespace one {
> namespace two {
> void ff();
> }
> }
> 
> namespace foo { void fun(); }
> void foo::fun() {...}
> ```
> 
> this case was working before the patch, and now is broken after this patch. It is not a common case, probably ok for now.
You are correct that this will not work. It is not a regression, however, since it was broken before too. Prior to this patch, the using would be inserted inside the namespace foo { }, so while the using statement would compile, it wouldn't affect the out-of-line definition of the function, meaning removing the qualifier would not work.

The insertion point logic will have to change a little when we add the feature to remove all other full qualifiers for that name. I think it might be best to address these corner cases at that point, but I can also do it here if you prefer.


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