id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc	planetversion	pltversion
247	mutator error message for empty program unclear	robby	plai	"This program

  #lang planet plai/plai:1:8/mutator

produces this error message

  #%module-begin: bad syntax in: (#%module-begin)

but would be better if it said ""expected ..."" and gave me a schematic of the expression it expected to find there. Similarly, these programs all produce bad error messages:

  #lang planet plai/plai:1:8/mutator
  ()

  #lang planet plai/plai:1:8/mutator
  1

  #lang planet plai/plai:1:8/mutator
  (a b c)

"	defect	closed	major		plai/plai.plt	fixed			(1 12)	4.2.4.2