fix: koch_snowflake

examples/koch_snowflake/Makefile

@@ -1,4 +1,3 @@
 run:
-	moon build
-	wat2wasm target/build/main/main.wat --output=target/draw.wasm
-	npx serve ./
+	moon build --target wasm-gc
+	python3 -m http.server 8000

examples/koch_snowflake/index.html

@@ -30,10 +30,10 @@
 
   var canvas = document.getElementById("canvas"); 
 
-  WebAssembly.instantiateStreaming(fetch("target/draw.wasm"), spectest).then(
+  WebAssembly.instantiateStreaming(fetch("target/wasm-gc/release/build/lib/lib.wasm"), spectest).then(
     (obj) => {
       obj.instance.exports._start();
-      const draw = obj.instance.exports["koch_snowflake/main::draw"];
+      const draw = obj.instance.exports["draw"];
       var ctx = canvas.getContext("2d");
       ctx.strikeStyle="#000";
       draw(ctx, 1);

examples/koch_snowflake/lib/koch.mbt

@@ -18,7 +18,7 @@ fn cos(x : Double) -> Double = "canvas" "cos"
 fn get_pi() -> Double = "canvas" "get_pi"
 
 fn koch(ctx : Canvas_ctx, x1 : Double, y1 : Double, x2 : Double,
-        y2 : Double, n : Double, m : Double) {
+        y2 : Double, n : Double, m : Double) -> Unit {
   ctx.clear_rect(0.0, 0.0, 400.0, 400.0)
   let x3 = (x2 - x1) / 3.0 + x1
   let y3 = (y2 - y1) / 3.0 + y1
@@ -42,7 +42,7 @@ fn koch(ctx : Canvas_ctx, x1 : Double, y1 : Double, x2 : Double,
   koch(ctx, x4, y4, x2, y2, n, m)
 }
 
-pub fn draw(ctx : Canvas_ctx, deep : Double) {
+pub fn draw(ctx : Canvas_ctx, deep : Double) -> Unit {
   ctx.begin_path()
   let y = 80.0 + cos(get_pi() / 6.0) * 200.0
   koch(ctx, 150.0, y, 250.0, 80.0, 0.0, deep)

examples/koch_snowflake/lib/moon.pkg.json

@@ -1,3 +1,9 @@
 {
-  "name": "lib"
+  "link": {
+    "wasm-gc": {
+      "exports": [
+        "draw"
+      ]
+    }
+  }
 }