Suppose I fix a bug like this:

-void splodge(int c) {
+void splodge(long c) {

And I also add a new function:

+int blorf() { return s_blorfulocity / s_RAT; }

Then when I run darcs record it will offer me to record this hunk

-void splodge(int c) {
+int blorf() { return s_blorfulocity / s_RAT; }
+
+void splodge(long c) {

I don't want to record that hunk!

What I want is to record those two conceptual changes in two separate patches.