Clangd cannot complete concepts correctly

[24bit-xjkp]

Clangd cannot intellisense concepts even if I set "std=c++20" in the compile_commands.json
For example,

#include <concepts>
template <typename T>
concept A = std::same_as<T, int>;

and the .vscode/compile_commands.json

[
{
 "directory": "C:\\Users\\Administrator.SKY-20190521TXE\\source\\repos",
 "arguments": ["clang.exe", "-c", "-Qunused-arguments", "-std=c++20"],
 "file": "Test.cpp"
}
]

and the clangd arguments

"clangd.arguments": [
  "--background-index",
  "--compile-commands-dir=.vscode",
  "-j=8",
  "--query-driver=clang",
  "--clang-tidy",
  "--completion-style=detailed",
  "--pch-storage=memory",
  "--inlay-hints",
  "--header-insertion=never",
  "--function-arg-placeholders"
]

clangd will not autocomplete the c++ key word "concept" and list the concepts in .
Of cause,clang++ can compile the file correctly.
And after I finished the code segment manually,clangd did not report any errors, color the words correctly except concepts.
Logs
Well,clangd is running normally.There is no error in the output windows.

System information
clangd version:14.0.0 (https://github.com/llvm/llvm-project 329fda39c507e8740978d10458451dcdb21563be)

Editor:vscode-insiders
LSP plugs:clangd0.1.15

Operating system:Windows

[HighCommander4]

Could you elaborate on the bolded part please:

clangd will not autocomplete the c++ key word "concept" and list the concepts in .

Other than auto-completion for the concept keyword itself, is there another place where completion is not working as expected? Please be specific about where the cursor is when you invoke completion, and what completion proposals you're expecting.

[HighCommander4]

Keyword completion is tracked in #89.

[24bit-xjkp]

Other than auto-completion for the concept keyword itself, is there another place where completion is not working as expected? Please be specific about where the cursor is when you invoke completion, and what completion proposals you're expecting.

As you see,clangd cannot find the existed concepts in the files.And if I finished the sentence manually

clangd do not color it,since the concept will be recognized as a type template and colored green by the plug Microsoft C/C++.

[HighCommander4]

clangd do not color it

clangd does give concept names a semantic token, but it uses a dedicated concept semantic token type rather than typeParameter. This token type is non-standard and therefore not included in most themes, but you can define a color for it by adding the following to your vscode settings:

  "editor.semanticTokenColorCustomizations": {
    "enabled": true,
    "rules": {
      "concept": {
        "foreground": "#AABBCC",
      },
    }
  }

[ilya-biryukov]

I have prepared a change to fix completion and find references: https://reviews.llvm.org/D124441 (has not landed yet)
A list of things that we still need to look at:

• rename and semantic highlighting for concepts (i.e. the code for findExplicitReferences )
• go-to and find references for concepts at declaration specifier position Concept auto i = .... This probably involves changing the AST or RecursiveASTVisitor to expose concept as a separate node.
• code completion should not add template argument list in some cases. In particular, non-expression positions, e.g. template<std::is_integral T> and std::is_integral auto i = ...
• hover