ykiko ec4c47d949 Add code completion for C++20 keywords. (#107982) ...

This commit adds code completion for C++20 keywords, fix
https://github.com/llvm/llvm-project/issues/107868.

1. complete `concept` in template context
    - [x] `template<typename T> conce^` -> `concept`
    - [ ] `conce^`

2. complete `requires` 
- [x] constraints in template context: `template<typename T> requi^` ->
`requires`
- [x] requires expression: `int x = requ^` -> `requires (parameters) {
requirements }`
- [x] nested requirement: `requires { requ^ }` -> `requires expression
;`

3. complete coroutine keywords
    - [x] `co_await^` in expression: `co_aw^` -> `co_await expression;`
- [x] `co_yield` in function body: `co_yi^` -> `co_yield expression;`
- [x] `co_return` in function body: `co_re^` -> `co_return expression;`

4. specifiers: `char8_t`, `consteval`, `constinit`

2024-11-26 13:03:39 +01:00

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