anchor.diff:  
   (define-php-macro vm-go-nil (val tag)
     (if (< 503 *php-version*)
  -      (php-line "if (!$" val "&&$" val "!==0) { $_I_=" tag "; continue; }")
  -      (php-line "if (!$" val "&&$" val "!==0) goto _I_" tag)))
  +      (php-line "if (!$" val "&&$" val "!=0) { $_I_=" tag "; continue; }")
  +      (php-line "if (!$" val "&&$" val "!=0) goto _I_" tag)))
   
   ;;;; FUNCTIONS
   
  
positive.code: 
  ;;;; VARIABLES
  
  (defun php-stack (x)
    ($ '_I_S x))
  
  (define-php-macro %stack (x)
    (if (transpiler-stack-locals? *php-transpiler*)
    	  `(%transpiler-native "_locals[" ,x "]")
        (php-stack x)))
  
  ;; Experimental for lambda-export.
  (define-php-macro %vec (v i)
    `(%transpiler-native "$" ,v "[" ,(php-dollarize i) "]"))
  
negative.code: (define-php-macro %%funref (name fi-sym)
    (let fi (get-lambda-funinfo-by-sym fi-sym)
      (if (funinfo-ghost fi)
    	  	`(%funref (%transpiler-string ,(symbol-name name)) ,(funinfo-lexical (funinfo-parent fi)))
  	    name)))
  
  ;;;; ASSIGNMENT
  