Invalid JS: Splatted statement causes if block inside array element

[satyr]

$ coffee -bpe '[a if b...]'
var __slice = Array.prototype.slice;
__slice.call(  if (b) {
    a;
  });

$ coffee -e '[a if b...]'

.:3
  __slice.call(    if (b) {
                   ^^
SyntaxError: Unexpected token if

[GeoffreyBooth]

Either a duplicate or else very closely related to #4260.

[GeoffreyBooth]

Fixed by #4644.