| commit | b412ec5d3924c7570c2c96106f95a92403a4e09b | [log] [tgz] |
|---|---|---|
| author | Younan Zhang <zyn7109@gmail.com> | Tue Aug 27 09:25:53 2024 +0800 |
| committer | GitHub <noreply@github.com> | Tue Aug 27 09:25:53 2024 +0800 |
| tree | 03b9f04a2ce0b7023e7bfa03dde9bb0f41a994d9 | |
| parent | 87157ab0f672a4755d231494b2162939811a014f [diff] |
[Clang][Sema] Revisit the fix for the lambda within a type alias template decl (#89934) In the last patch #82310, we used template depths to tell if such alias decls contain lambdas, which is wrong because the lambda can also appear as a part of the default argument, and that would make `getTemplateInstantiationArgs` provide extra template arguments in undesired contexts. This leads to issue #89853. Moreover, our approach for https://github.com/llvm/llvm-project/issues/82104 was sadly wrong. We tried to teach `DeduceReturnType` to consider alias template arguments; however, giving these arguments in the context where they should have been substituted in a `TransformCallExpr` call is never correct. This patch addresses such problems by using a `RecursiveASTVisitor` to check if the lambda is contained by an alias `Decl`, as well as twiddling the lambda dependencies - we should also build a dependent lambda expression if the surrounding alias template arguments were dependent. Fixes #89853 Fixes #102760 Fixes #105885
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