txt: ## invocantmarker.md
  class X::Syntax::Signature::InvocantMarker
  
  Compilation error due to a misplaced invocant marker in a signature
  
  ```raku
  class X::Syntax::Signature::InvocantMarker does X::Syntax { }
  ```
  
  Syntax error when the invocant in a signature is anywhere else than after the first parameter.
  
  For example
  
  ```raku
  :($a, $b: $c);
  
  ```
  
  dies with
  
  ｢text｣ without highlighting
  
  ```
  
  
  ```
  
  ===SORRY!===
  Can only use : as invocant marker in a signature after the first parameter
  
  
  ```
  
  
  ```
  
  See also: [`Signature`](/type/Signature).
  