I like the macro transformers in R5RS Scheme. Here's how the multi-binding if-let and when-let look:

  (define-syntax if-let
    (syntax-rules ()
      ((if-let ((var value) ...)
              consequent ...)
       (let ((var value) ...)
         (if (and var ...)
             consequent ...)))))
          
  (define-syntax when-let
    (syntax-rules ()
      ((when-let (binding)
                 body ...)
       (if-let (binding)
               (begin body ...)))))