| commit | a0d266d705d6c145e8daa08a08f70e9498ec3d0b | [log] [tgz] |
|---|---|---|
| author | Krystian Stasiowski <sdkrystian@gmail.com> | Tue Jan 30 08:28:13 2024 -0500 |
| committer | GitHub <noreply@github.com> | Tue Jan 30 08:28:13 2024 -0500 |
| tree | ef03372bb5f05229af5483962beefc6b2daaac07 | |
| parent | 6251b6bd8d219fe2d99d125095622566721fe6f4 [diff] |
[Clang][Sema] Allow elaborated-type-specifiers that declare member class template explict specializations (#78720) According to [[dcl.type.elab] p2](http://eel.is/c++draft/dcl.type.elab#2): > If an [elaborated-type-specifier](http://eel.is/c++draft/dcl.type.elab#nt:elaborated-type-specifier) is the sole constituent of a declaration, the declaration is ill-formed unless it is an explicit specialization, an explicit instantiation or it has one of the following forms [...] Consider the following: ```cpp template<typename T> struct A { template<typename U> struct B; }; template<> template<typename U> struct A<int>::B; // #1 ``` The _elaborated-type-specifier_ at `#1` declares an explicit specialization (which is itself a template). We currently (incorrectly) reject this, and this PR fixes that. I moved the point at which _elaborated-type-specifiers_ with _nested-name-specifiers_ are diagnosed from `ParsedFreeStandingDeclSpec` to `ActOnTag` for two reasons: `ActOnTag` isn't called for explicit instantiations and partial/explicit specializations, and because it's where we determine if a member specialization is being declared. With respect to diagnostics, I am currently issuing the diagnostic without marking the declaration as invalid or returning early, which results in more diagnostics that I think is necessary. I would like feedback regarding what the "correct" behavior should be here.
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