phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

apps/tests/macro/exception/loop_postfix_sugar.hako

@@ -0,0 +1,15 @@
+function f(x) {
+  return x
+}
+
+function main(args) {
+  local i = 0
+  loop(i < 2) {
+    with_cleanup(
+      postfix_catch(f(i), "Error", fn(e){ print(e) }),
+      fn(){ print("cleanup") }
+    )
+    i = i + 1
+  }
+}
+