[Feature request] Label autocompletion

[BigBoyBarney]

Hi!

I have no idea how the parser works, so this may not be feasible, but I thought I'd ask!

I'm a big abuser of labels, and having autocomplete for them would be really cool.

Example:

// curl cleanup code
added_handles := curl.multi_get_handles(multi_handle)
defer curl.free(added_handles)

handle_index: int
Clean_Up_Added_Handles: for {
	handle := added_handles[handle_index]
	if handle == nil { break Clean_Up_Added_Handles } // autocomplete `Clean_Up_Added_Handles` here

	curl.multi_remove_handle(multi_handle, handle)
	curl.easy_cleanup(handle)
	handle_index += 1
}
curl.multi_cleanup(multi_handle)

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Cheers!