Empty macro args freeze the assembler

[Rangi42]

Uncommenting either of those final lines gives an error and stops assembling at that point, without exiting the process.

mac: MACRO
  for i, _NARG
    println "arg ", i+1, ": <\1>"
    shift
  endr
  println
ENDM

  mac ,1,2   ; arg $1: <1> arg $2: <2>
;  mac 3,4,  ; syntax error, unexpected newline, expecting string
;  mac 5,,6  ; syntax error, unexpected ",", expecting string

It's also surprising that the leading ',' in 'mac ,1,2' has no effect.

[ISSOtm]

Shouldn't empty macro args produce a -Wextra warning?

[Rangi42]

I'll add a -Wempty-arg warning for them, sure.