txt: ## perl5var.md
  class X::Syntax::Perl5Var
  
  Compilation error due to use of Perl-only default variables
  
  ```raku
  class X::Syntax::Perl5Var does X::Syntax { }
  ```
  
  Syntax error thrown when some piece of code tries to use one of the old Perl variables (and it does not error for some other reason).
  
  ```raku
  say $];
  
  ```
  
  dies with
  
  ｢text｣ without highlighting
  
  ```
  
  
  ```
  
  Unsupported use of $] variable; in Raku please use $*RAKU.version or $*RAKU.compiler.version
  
  
  ```
  
  
  ```
  
  For every unsupported variable (which include most `$^'letter'` constructs, as well as others like `$"`, the error message will mention that the variable is unsupported and the equivalent commands you could use.
  