That's an implementation detail though. Although it's a lot of work to fix, it's not insurmountable. You would need your development browser to support Coffescript natively. It's not really a serious problem if IE7 generates a Javascript back-trace, right?
The important thing is if Coffeescript really does significantly reduce line count and by extension bug rates. I'm not sure it does, generally syntactical sugar doesn't have that effect.
I hope it does. My life seems nicer when writing Coffeescript vs JS.
You don't need to support CoffeeScript natively. The answer is simple and is called source mapping: the output code carries comments that map each line to a line in the source file. This will also work for LESS and any other transpilers.
The important thing is if Coffeescript really does significantly reduce line count and by extension bug rates. I'm not sure it does, generally syntactical sugar doesn't have that effect.
I hope it does. My life seems nicer when writing Coffeescript vs JS.