@@ -22,7 +22,10 @@ public class Effect {
 	private Effect() {}
 
     public static P1<Unit> f(Effect0 e) {
-        return P.lazy(u -> unit());
+      return P.lazy(() -> {
+        e.f();
+        return unit();
+      });
     }
 
     /**
@@ -92,7 +95,7 @@ public static <A, B, C, D, E> F5<A, B, C, D, E, Unit> f(Effect5<A, B, C, D, E> z
    * @param f The function to map over the effect.
    * @return An effect after a contra-variant map.
    */
-  public final <A, B> Effect1<B> comap(Effect1<A> e1, final F<B, A> f) {
+  public static final <A, B> Effect1<B> comap(Effect1<A> e1, final F<B, A> f) {
     return b -> e1.f(f.f(b));
   }