coc-settings.json

{
  "Lua.telemetry.enable": true,
  "languageserver": {
      "ccls": {
        "command": "ccls",
        "filetypes": ["c", "cc", "cpp", "c++", "objc", "objcpp"],
        "rootPatterns": [".ccls", "compile_commands.json", ".git/", ".hg/"],
        "initializationOptions": {
          "highlight": {"lsRanges": true},
          "cache": {
           "directory": "/tmp/ccls"
         },
         "completion": {
           "detailedLable": true,
            "placeholder": true
          },
          "index": {
           "onChange": false,
           "initialNoLinkage": true,
           "threads": 2
         },
         "compilationDatabaseDirectory": ".vscode/"
       }
      },
      "golang": {
        "command": "gopls",
        "rootPatterns": ["go.mod"],
        "filetypes": ["go"]
      },
      "rust": {
        "command": "rust-analyzer",
        "filetypes": ["rust"],
        "rootPatterns": ["Cargo.toml"],
        "rust-analyzer.cargo.features" :["console-test"]
      }
   }
}