Improper highlighting of multi-line function definitions

I'm writing some big coffee files, and as the program is growing in complexity, my function & argument names have become a little longer, thus for readability's sake, i've to break the function declaration line into two or more lines like so:

``` coffee-script
testFunctionWhichBecameLong = (opt_1, opt_2,
opt_3, opt_4) ->
return opt1 * opt2 - opt3 / opt4
```

These kinds of functions are not being highlighted, and thus the function starts to look like an ugly duckling...

Look at this image for more details:

Reproduce the reported CoffeeScript syntax-highlighting problem with the multiline function definition shown in the issue. Inspect the bundle's CoffeeScript highlighting rules and compare the highlighting of single-line and multiline declarations; done means the function and its arguments are highlighted consistently across the line break.

Written by the indexing model from the issue text.