One can boot into the command from grub by editing kernel parameters.

Another way is edition the grub configuration and setting GRUB_CMDLINE_LINUX_DEFAULT="text". But now it's not possible to boot into a graphical env.

So is there way to create menu entry just for command line so it will be one of the ways to log into the system?

I use Helix Editor and by default it uses clangd as LSP server.

But when I use "newer" C++20 features I get warning messages in the editor that they are only available in "later" C++ versions or I get straight up error messages.

So how do I tell clangd that I am writing C++20 code? I am guessing passing an argument (-std=c++20) or creating a "project properties" file...

This is the Helix Editor configuration file, languages.toml:

[[language]]
name = "cpp"
language-server = { command = "clangd", args = [] }
auto-format = true

Please let me know the right way to do it.

The documentation uses is in the example for "declaration patterns" but the book I am reading uses a switch statement. But when I try to run the code I run into errors.

using System;

public class Program
{
  public static void Main()
  {
    var o = 42;

    switch (o) {
      case string s:
        Console.WriteLine($"A piece of string is {s.Length} long");
        break;

      case int i:
        Console.WriteLine($"That's numberwang! {i}");
        break;
    }
  }
}

Error:

Compilation error (line 7, col 6): An expression of type 'int' cannot be handled by a pattern of type 'string'.

EDIT

Changing from

var o = 42;

to

object o = 42;

worked.

Full code: https://github.com/idg10/prog-cs-10-examples/blob/main/Ch02/BasicCoding/BasicCoding/Patterns.cs

What does "control falls through a switch statement" mean in this context? Control just moves on to the next statement?

I thought if there is no match and a default case doesn't exist it will raise an exception. Is it not true?