adjust lineNumber

gistfile1.js

macro m {
	rule {} => {
		(function() {
			return 
			{
				foo: "bar"
			}
		})
	}
}
function foo() {
	return m;
}
// expands to:
function foo() {
	return (function() {
			return
			{
				foo: "bar"
			}
		})
}
// but collapsing to one line is wrong
function foo() {
	return (function() { return {foo: "bar"} })
}