id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	difficulty
337	"Support ""fender"" in syntax-rules"	Kon Lovett		"* Allow optional ""fender"" in `syntax-rules'

  * <pattern> <fender> <template>

  * <fender> is an <s-expr> that must evaluate to ""true""

  * <fender> is evaluated as (and <fender> #t)

+ Useful since an er-transformer would otherwise be necessary for very common tasks.

- Muddies syntax-rules in that a procedural element is introduced

---

- (identifier? obj)

(define (identifier? obj)
  (let ((sans (strip-syntax obj)))
    (and (symbol? sans) (not (keyword? sans)) ) )

-(bound-identifier=? id1 id2)

-(free-identifier=? id1 id2)
"	enhancement	closed	not urgent at all		expander	4.5.x	wontfix		Kon Lovett