failed attempt at composifying

packages/core/controls.mjs

@@ -819,7 +819,15 @@ const _setter = (func, name) =>
   };
 
 generic_params.forEach(([type, name, description]) => {
-  controls[name] = (...pats) => _name(name, ...pats);
+  controls[name] = function (...pats) {
+    const result = _name(name, ...pats);
+
+    // Add a function for composing this control with another pattern
+    result.__compose = function (pat) {
+      return pat[name](...pats);
+    };
+    return result;
+  };
   Pattern.prototype[name] = _setter(controls[name], name);
 });
 

packages/core/pattern.mjs

@@ -1569,6 +1569,13 @@ export const outside = register('outside', function (factor, f, pat) {
  */
 export const lastOf = register('lastOf', function (n, func, pat) {
   const pats = Array(n - 1).fill(pat);
+  
+  // It seems we have a pattern, but with a 'compose' function, let's
+  // use that
+  if ('__compose' in func) {
+    func = func.__compose;
+  }
+  
   pats.push(func(pat));
   return slowcatPrime(...pats);
 });