Ilya Biryukov 75e16fd2c6 [Index] [clangd] Support for concept declarations and requires expressions ...

Add support for concepts and requires expression in the clang index.
Genarate USRs for concepts.

Also change how `RecursiveASTVisitor` handles return type requirement in
requires expressions. The new code unpacks the synthetic template parameter
list used for storing the actual expression. This simplifies
implementation of the indexing. No code seems to depend on the original
traversal anyway and the synthesized template parameter list is easily
accessible from inside the requires expression if needed.

Add tests in the clangd codebase.

Fixes https://github.com/clangd/clangd/issues/1103.

Reviewed By: sammccall

Differential Revision: https://reviews.llvm.org/D124441

2022-04-26 13:50:01 +00:00

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