zomg teh fix pasted by sjamaan on Fri Nov 27 22:43:36 2015

(define-syntax call
  (syntax-rules ()
    ((_ name ...)
     (string-append "[" (symbol->string 'name) ... "]"))))

Creating the string at compile time added by sjamaan on Fri Nov 27 22:50:56 2015

(begin-for-syntax (require-extension srfi-13 data-structures))

(define-syntax call
  (ir-macro-transformer
    (lambda (e i c)
      (string-append
        "["
        (string-concatenate 
          (map (o symbol->string strip-syntax) (cdr e)))
        "]"))))