anchor.diff:  open System
   
   let foo(x, y) = 
  -    let msg = String.Concat("Hello"," ","world")
  +    let msg = String.Concat("Hello", " ", "world")
       if msg.Length > 10 then 
           10 
       else 
  
positive.code: 
  let myLibraryEntity, myLibraryDecls =    
     match checkedFile.Declarations.[0] with 
     | FSharpImplementationFileDeclaration.Entity (e,subDecls) -> (e,subDecls)
     | _ -> failwith "unexpected"
  
  
  
negative.code: //
  // Visiting Let...
  // Visiting Call...
  // Visiting Const ("Hello", ...)
  // Visiting Const (" ", ...)
  // Visiting Const ("world", ...)
  // Visiting IfThenElse...
  // Visiting Call...
  // Visiting Call...
  