Nemerleで n == 1 && n == 2 && n == 3をtrueにする ref: https://qiita.com/kmizu/items/77c1f4244502c4dd4058

file0.txt

using Nemerle.Compiler;
macro @==(lhs, rhs) {
  <[
    true
  ]>
}

file1.txt

$ ncc -r Nemerle.Compiler.dll -t:dll eq_macro.n -o eq_macro.dll

file2.txt

using System;

class Hello
{
  static Main () : void
  {
    def a = 1;
    Console.WriteLine(a == 1 && a == 2 && a == 3);
  }
}

file3.txt

ncc -r eq_macro.dll Hello.n -o Hello.exe
Hello.n:7:9:7:10: warning: N168: a local value a was never used (defined in 'Main() : void')
Hello.n:7:9:7:10: hint: replace name with `_' or prefix it like `_bar' to avoid the warning
$ ./Hello.exe
True