moonscript/todo

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# TODO
-- error when assining a loop whose body doesn't end in expression
x = for x in y
y = 100
-- seems like running in moon messes up require order
- don't reuse _, put a local on it, so we don't keep around trash
-- swithc X with Func
- or= and=
- a do block for making a quick anon func and calling it
- error with stray comma at end of line
- ugly error if attempting to assign to rvalue like #hello
- dump node in mark, see why values are being parsed multiple times
- varargs that get put in a nested generated function aren't valid anymore:
- class expressions, x = class extends Hello do new: => print "hello"
* multiline comments
* table slices (almost)
* add continue keyword (ouch)
* combine for and if line decorators
* elseif with value that inserts lines
- need to decompose elif into if inside else
* export later?
x = 232
export x
* allow return anywhere in block
* any/every keywords for comprehensions? (what about iterators)
not working right:
double_args = (...) ->
[x * 2 for x in *{...}]
* let array items in table be defined without {} when indented
* allow dot access with names that are keywords: hello.then
* convert tree transformer to be depth first instead of breadth first (lazy)
-- for searching?
x = for thing in *things
if is_important thing
break thing