treat newline as space in argument lists

[StefanKarpinski]

This version doesn't parse:

run(`perl -le '$|=1; for(0..9){ print; sleep 1 }'`
    | prefixer("X",3) & prefixer("Y",3) & prefixer("Z",3)
    | prefixer("A",2) & prefixer("B",2))

even though this one does:

run(`perl -le '$|=1; for(0..9){ print; sleep 1 }'` |
    prefixer("X",3) & prefixer("Y",3) & prefixer("Z",3) |
    prefixer("A",2) & prefixer("B",2))

[JeffBezanson]

I can fix it, but we might want to think about it. Some contexts (statement blocks and matrices) are newline-sensitive, for example:

begin
  2
  +3
end

does not parse as "2+3". We have to decide if it's ok for argument lists to be different.

[StefanKarpinski]

The current behavior seems unexpected. What are the downsides of making newlines inside of parens "just whitespace"?

[JeffBezanson]

The only downside, which is pretty minor, is that the same syntax won't work in all cases. For example

f(1
  |
  2)

applies f to 1|2, but

{1
 |
 2}

makes a 3-element cell array.

[StefanKarpinski]

In that case I'd say go for it.