fix fold/empty list bug

build/out.mjs

@@ -6489,7 +6489,7 @@ var __emscripten_stack_alloc = (a0) => (__emscripten_stack_alloc = wasmExports['
 var _emscripten_stack_get_current = () => (_emscripten_stack_get_current = wasmExports['emscripten_stack_get_current'])();
 var ___cxa_is_pointer_type = createExportWrapper('__cxa_is_pointer_type', 1);
 var dynCall_jiji = Module['dynCall_jiji'] = createExportWrapper('dynCall_jiji', 5);
-var ___emscripten_embedded_file_data = Module['___emscripten_embedded_file_data'] = 1835948;
+var ___emscripten_embedded_file_data = Module['___emscripten_embedded_file_data'] = 1836260;
 function invoke_i(index) {
   var sp = stackSave();
   try {

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@ludus/ludus-js-pure",
-  "version": "0.1.22",
+  "version": "0.1.23",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@ludus/ludus-js-pure",
-      "version": "0.1.22",
+      "version": "0.1.23",
       "license": "GPL-3.0",
       "devDependencies": {
         "shadow-cljs": "^2.26.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ludus/ludus-js-pure",
-  "version": "0.1.22",
+  "version": "0.1.23",
   "description": "A Ludus interpreter in a pure JS function.",
   "type": "module",
   "main": "build/ludus.mjs",

prelude.ld

@@ -192,7 +192,9 @@ fn list {
 
 fn fold {
 	"Folds a list."
+	(f as :fn, []) -> []
 	(f as :fn, xs as :list) -> fold (f, xs, f ())
+	(f as :fn, [], root) -> []
 	(f as :fn, xs as :list, root) -> loop (root, first (xs), rest (xs)) with {
 		(prev, curr, []) -> f (prev, curr)
 		(prev, curr, remaining) -> recur (

src/ludus.janet

@@ -52,7 +52,8 @@
 (comment
 # (do
 (def source `
-rest ([])
+fn id (x) -> x
+map (id, [])
 `)
 (def out (-> source 
  ludus