further loading

internal/engine.cm

@@ -49,9 +49,13 @@ function ends_with(str, suffix) {
   return search(str, suffix, -length(suffix)) != null
 }
 
+print("engine: loading js")
 var js = use_embed('js')
+print("engine: loading fd")
 var fd = use_embed('fd')
+print("engine: loaded fd")
 
+print("engine: getting home")
 // Get the shop path from HOME environment
 var home = os.getenv('HOME') || os.getenv('USERPROFILE')
 if (!home) {
@@ -76,34 +80,49 @@ function use_core(path) {
   if (use_cache[cache_key])
     return use_cache[cache_key];
 
+  print(`engine: use_core('${path}') - embed`)
   var sym = use_embed(replace(path, '/', '_'))
 
   // Core scripts are in packages/core/
   var file_path = core_path + '/' + path + MOD_EXT
 
   if (fd.is_file(file_path)) {
+    print(`engine: use_core('${path}') - loading script`)
     var script_blob = fd.slurp(file_path)
     var script = text(script_blob)
     var mod = `(function setup_module(use){${script}})`
     var fn = mach_eval('core:' + path, mod)
+    if (fn == null) {
+      print(`engine: use_core('${path}') - mach_eval returned null!`)
+      return null
+    }
+    print(`engine: use_core('${path}') - calling (fn type: ${typeof(fn)})`)
     var result = call(fn,sym, [use_core])
+    print(`engine: use_core('${path}') - done`)
     use_cache[cache_key] = result;
     return result;
   }
 
+  print(`engine: use_core('${path}') - using embed directly`)
   use_cache[cache_key] = sym;
   return sym;
 }
 
+print("engine: loading blob")
 var blob = use_core('blob')
+print("engine: loaded blob")
 
 function actor() {
 
 }
 
+print("engine: loading actor")
 var actor_mod = use_core('actor')
+print("engine: loading wota")
 var wota = use_core('wota')
+print("engine: loading nota")
 var nota = use_core('nota')
+print("engine: loaded nota")
 
 function is_actor(value) {
   return is_object(value) && value[ACTORDATA]
@@ -191,10 +210,15 @@ function actor_die(err)
 
 
 
+print("engine: setting up actor_die")
 actor_mod.on_exception(actor_die)
 
+print("engine: setting cell args")
+print(`engine: init is ${init}`)
 _cell.args = init != null ? init : {}
+print("engine: args set")
 _cell.id = "newguy"
+print("engine: id set")
 
 function create_actor(desc = {id:guid()}) {
   var actor = {}
@@ -202,19 +226,25 @@ function create_actor(desc = {id:guid()}) {
   return actor
 }
 
+print("engine: creating $_")
 var $_ = {}
+print("engine: creating self actor")
 $_.self = create_actor()
-
+print("engine: setting os props")
 os.use_cache = use_cache
 os.global_shop_path = shop_path
 os.$_ = $_
+print("engine: os props set")
 
+print("engine: loading shop")
 var shop = use_core('internal/shop')
-
+print("engine: loaded shop, loading json")
 var json = use_core('json')
 var time = use_core('time')
 
+print("engine: loading pronto")
 var pronto = use_core('pronto')
+print("engine: loaded pronto")
 var fallback = pronto.fallback
 var parallel = pronto.parallel
 var race = pronto.race

internal/kim.c

@@ -75,7 +75,11 @@ static const JSCFunctionListEntry js_kim_funcs[] = {
 
 JSValue js_kim_use(JSContext *js)
 {
-  JSValue mod = JS_NewObject(js);
-  JS_SetPropertyFunctionList(js, mod, js_kim_funcs, countof(js_kim_funcs));
-  return mod;
+  JSGCRef mod_ref;
+  JS_PushGCRef(js, &mod_ref);
+  mod_ref.val = JS_NewObject(js);
+  JS_SetPropertyFunctionList(js, mod_ref.val, js_kim_funcs, countof(js_kim_funcs));
+  JSValue result = mod_ref.val;
+  JS_PopGCRef(js, &mod_ref);
+  return result;
 }

internal/os.c

@@ -579,7 +579,11 @@ JSValue js_os_use(JSContext *js) {
   JS_NewClassID(&js_dylib_class_id);
   JS_NewClass(js, js_dylib_class_id, &js_dylib_class);
 
-  JSValue mod = JS_NewObject(js);
-  JS_SetPropertyFunctionList(js,mod,js_os_funcs,countof(js_os_funcs));
-  return mod;
+  JSGCRef mod_ref;
+  JS_PushGCRef(js, &mod_ref);
+  mod_ref.val = JS_NewObject(js);
+  JS_SetPropertyFunctionList(js, mod_ref.val, js_os_funcs, countof(js_os_funcs));
+  JSValue result = mod_ref.val;
+  JS_PopGCRef(js, &mod_ref);
+  return result;
 }

internal/os_emscripten.c

@@ -172,7 +172,11 @@ static const JSCFunctionListEntry js_os_funcs[] = {
 };
 
 JSValue js_os_use(JSContext *js) {
-    JSValue mod = JS_NewObject(js);
-    JS_SetPropertyFunctionList(js, mod, js_os_funcs, countof(js_os_funcs));
-    return mod;
+    JSGCRef mod_ref;
+    JS_PushGCRef(js, &mod_ref);
+    mod_ref.val = JS_NewObject(js);
+    JS_SetPropertyFunctionList(js, mod_ref.val, js_os_funcs, countof(js_os_funcs));
+    JSValue result = mod_ref.val;
+    JS_PopGCRef(js, &mod_ref);
+    return result;
 }

internal/os_playdate.c

@@ -172,7 +172,11 @@ static const JSCFunctionListEntry js_os_funcs[] = {
 };
 
 JSValue js_os_use(JSContext *js) {
-    JSValue mod = JS_NewObject(js);
-    JS_SetPropertyFunctionList(js, mod, js_os_funcs, countof(js_os_funcs));
-    return mod;
+    JSGCRef mod_ref;
+    JS_PushGCRef(js, &mod_ref);
+    mod_ref.val = JS_NewObject(js);
+    JS_SetPropertyFunctionList(js, mod_ref.val, js_os_funcs, countof(js_os_funcs));
+    JSValue result = mod_ref.val;
+    JS_PopGCRef(js, &mod_ref);
+    return result;
 }

internal/shop.cm

@@ -1,5 +1,6 @@
+print("shop: starting")
 var toml = use('toml')
-
+print("shop: loaded toml")
 var json = use('json')
 var fd = use('fd')
 var http = use('http')
@@ -142,8 +143,10 @@ function package_in_shop(package) {
 
 function abs_path_to_package(package_dir)
 {
-  if (!fd.is_file(package_dir + '/cell.toml'))
-    throw Error('Not a valid package directory (no cell.toml): ' + package_dir)
+  if (!fd.is_file(package_dir + '/cell.toml')) {
+    log.error('Not a valid package directory (no cell.toml): ' + package_dir)
+    disrupt
+  }
 
   var packages_prefix = get_packages_dir() + '/'
   var core_dir = packages_prefix + core_package
@@ -175,14 +178,15 @@ function abs_path_to_package(package_dir)
     return package_dir
 
   // For local directories (e.g., linked targets), read the package name from cell.toml
-  try {
+  var toml_pkg = null
+  var read_toml = function() {
     var content = text(fd.slurp(package_dir + '/cell.toml'))
     var cfg = toml.decode(content)
     if (cfg.package)
-      return cfg.package
-  } catch (e) {
-    // Fall through
-  }
+      toml_pkg = cfg.package
+  } disruption {}
+  read_toml()
+  if (toml_pkg) return toml_pkg
 
   return null
 }
@@ -299,12 +303,14 @@ Shop.resolve_package_info = function(pkg) {
 
 // Verify if a package name is valid and return status
 Shop.verify_package_name = function(pkg) {
-  if (!pkg) throw Error("Empty package name")
-  if (pkg == 'local') throw Error("local is not a valid package name")
-  if (pkg == 'core') throw Error("core is not a valid package name")
+  if (!pkg) { log.error("Empty package name"); disrupt }
+  if (pkg == 'local') { log.error("local is not a valid package name"); disrupt }
+  if (pkg == 'core') { log.error("core is not a valid package name"); disrupt }
 
-  if (search(pkg, '://') != null)
-    throw Error(`Invalid package name: ${pkg}; did you mean ${array(pkg, '://')[1]}?`)
+  if (search(pkg, '://') != null) {
+    log.error(`Invalid package name: ${pkg}; did you mean ${array(pkg, '://')[1]}?`)
+    disrupt
+  }
 }
 
 // Convert module package to download URL
@@ -441,7 +447,7 @@ ${script}
 // Resolve module function, hashing it in the process
 // path is the exact path to the script file
 function resolve_mod_fn(path, pkg) {
-  if (!fd.is_file(path)) throw Error(`path ${path} is not a file`)
+  if (!fd.is_file(path)) { log.error(`path ${path} is not a file`); disrupt }
 
   var file_info = Shop.file_info(path)
   var file_pkg = file_info.package
@@ -576,32 +582,38 @@ Shop.open_package_dylib = function(pkg) {
 
   var toml_path = pkg_dir + '/cell.toml'
   if (fd.is_file(toml_path)) {
-    try {
+    var read_toml_disrupted = false
+    var do_read_toml = function() {
       var content = text(fd.slurp(toml_path))
       var cfg = toml.decode(content)
       if (cfg.dependencies) {
         arrfor(array(cfg.dependencies), function(alias, i) {
           var dep_pkg = cfg.dependencies[alias]
-          try {
+          var open_dep = function() {
             Shop.open_package_dylib(dep_pkg)
-          } catch (dep_e) {
-            // Dependency dylib load failed, continue with others
-          }
+          } disruption {}
+          open_dep()
         })
       }
-    } catch (e) {
-      // Error reading toml, continue
+    } disruption {
+      read_toml_disrupted = true
     }
+    do_read_toml()
   }
 
   var dl_path = get_lib_path(pkg)
   if (fd.is_file(dl_path)) {
     if (!open_dls[dl_path]) {
-      try {
+      var open_disrupted = false
+      var do_open = function() {
         open_dls[dl_path] = os.dylib_open(dl_path)
-      } catch (e) {
+      } disruption {
+        open_disrupted = true
+      }
+      do_open()
+      if (open_disrupted) {
         dylib_visited[pkg] = false
-        throw e
+        disrupt
       }
     }
   }
@@ -836,14 +848,14 @@ function execute_module(info)
       // C only
       used = call_c_module(c_resolve)
   } else {
-      throw Error(`Module ${info.path} could not be found`)
+      log.error(`Module ${info.path} could not be found`); disrupt
   }
 
 //  if (is_function(used))
 //    throw Error('C module loader returned a function; did you forget to call it?')
 
   if (!used)
-    throw Error(`Module ${info} returned null`)
+    log.error(`Module ${info} returned null`); disrupt
 
 //  stone(used)
   return used
@@ -852,16 +864,20 @@ function execute_module(info)
 function get_module(path, package_context) {
   var info = resolve_module_info(path, package_context)
 
-  if (!info)
-    throw Error(`Module ${path} could not be found in ${package_context}`)
+  if (!info) {
+    log.error(`Module ${path} could not be found in ${package_context}`)
+    disrupt
+  }
 
   return execute_module(info)
 }
 
 Shop.use = function use(path, package_context) {
   var info = resolve_module_info(path, package_context)
-  if (!info)
-    throw Error(`Module ${path} could not be found in ${package_context}`)
+  if (!info) {
+    log.error(`Module ${path} could not be found in ${package_context}`)
+    disrupt
+  }
 
   if (use_cache[info.cache_key])
     return use_cache[info.cache_key]
@@ -889,13 +905,20 @@ function fetch_remote_hash(pkg) {
   if (!api_url) return null
 
   
-  try {
+  var result = null
+  var fetch_disrupted = false
+  var do_fetch = function() {
     var resp = http.fetch(api_url)
-    return Shop.extract_commit_hash(pkg, text(resp))
-  } catch (e) {
+    result = Shop.extract_commit_hash(pkg, text(resp))
+  } disruption {
+    fetch_disrupted = true
+  }
+  do_fetch()
+  if (fetch_disrupted) {
     log.console("Warning: Could not check for updates for " + pkg)
     return null
   }
+  return result
 }
 
 // Download a zip for a package at a specific commit and cache it
@@ -909,14 +932,20 @@ function download_zip(pkg, commit_hash) {
     return null
   }
 
-  try {
-    var zip_blob = http.fetch(download_url)
+  var zip_blob = null
+  var dl_disrupted = false
+  var do_download = function() {
+    zip_blob = http.fetch(download_url)
     fd.slurpwrite(cache_path, zip_blob)
-    return zip_blob
-  } catch (e) {
-    log.error("Download failed for " + pkg + ": " + e)
+  } disruption {
+    dl_disrupted = true
+  }
+  do_download()
+  if (dl_disrupted) {
+    log.error("Download failed for " + pkg)
     return null
   }
+  return zip_blob
 }
 
 // Get zip from cache, returns null if not cached
@@ -1027,8 +1056,7 @@ Shop.extract = function(pkg) {
 
   var zip_blob = get_package_zip(pkg)
 
-  if (!zip_blob)
-    throw Error("No zip blob available for " + pkg)
+  if (!zip_blob) { log.error("No zip blob available for " + pkg); disrupt }
 
   // Extract zip for remote package
   install_zip(zip_blob, target_dir)
@@ -1113,7 +1141,7 @@ Shop.update = function(pkg) {
 
 function install_zip(zip_blob, target_dir) {
   var zip = miniz.read(zip_blob)
-  if (!zip) throw Error("Failed to read zip archive")
+  if (!zip) { log.error("Failed to read zip archive"); disrupt }
 
   if (fd.is_link(target_dir)) fd.unlink(target_dir)
   if (fd.is_dir(target_dir)) fd.rmdir(target_dir, 1)
@@ -1165,14 +1193,14 @@ Shop.get = function(pkg) {
   if (!lock[pkg]) {
     var info = Shop.resolve_package_info(pkg)
     if (!info) {
-      throw Error("Invalid package: " + pkg)
+      log.error("Invalid package: " + pkg); disrupt
     }
     
     var commit = null
     if (info != 'local') {
       commit = fetch_remote_hash(pkg)
       if (!commit) {
-        throw Error("Could not resolve commit for " + pkg)
+        log.error("Could not resolve commit for " + pkg); disrupt
       }
     }
     

internal/testlib.cm

@@ -11,12 +11,13 @@ function is_valid_package(dir) {
 // Get current package name from cell.toml or null
 function get_current_package_name() {
   if (!is_valid_package('.')) return null
-  try {
+  var pkg_name = 'local'
+  var do_load = function() {
     var config = pkg.load_config(null)
-    return config.package || 'local'
-  } catch (e) {
-    return 'local'
-  }
+    if (config.package) pkg_name = config.package
+  } disruption {}
+  do_load()
+  return pkg_name
 }
 
 // Get the directory for a package

link.cm

@@ -66,12 +66,17 @@ Link.load = function() {
     return link_cache
   }
 
-  try {
+  var load_disrupted = false
+  var do_load = function() {
     var content = text(fd.slurp(path))
     var cfg = toml.decode(content)
     link_cache = cfg.links || {}
-  } catch (e) {
-    log.console("Warning: Failed to load link.toml: " + e)
+  } disruption {
+    load_disrupted = true
+  }
+  do_load()
+  if (load_disrupted) {
+    log.console("Warning: Failed to load link.toml")
     link_cache = {}
   }
   return link_cache
@@ -90,14 +95,16 @@ Link.add = function(canonical, target, shop) {
   // Validate canonical package exists in shop
   var lock = shop.load_lock()
   if (!lock[canonical]) {
-    throw Error('Package ' + canonical + ' is not installed. Install it first with: cell get ' + canonical)
+    log.error('Package ' + canonical + ' is not installed. Install it first with: cell get ' + canonical)
+    disrupt
   }
 
   // Validate target is a valid package
   if (starts_with(target, '/')) {
     // Local path - must have cell.toml
     if (!fd.is_file(target + '/cell.toml')) {
-      throw Error('Target ' + target + ' is not a valid package (no cell.toml)')
+      log.error('Target ' + target + ' is not a valid package (no cell.toml)')
+      disrupt
     }
   } else {
     // Remote package target - ensure it's installed
@@ -116,7 +123,8 @@ Link.add = function(canonical, target, shop) {
   var target_path = starts_with(target, '/') ? target : get_package_abs_dir(target)
   var toml_path = target_path + '/cell.toml'
   if (fd.is_file(toml_path)) {
-    try {
+    var read_deps_disrupted = false
+    var do_read_deps = function() {
       var content = text(fd.slurp(toml_path))
       var cfg = toml.decode(content)
       if (cfg.dependencies) {
@@ -128,16 +136,24 @@ Link.add = function(canonical, target, shop) {
             return
           }
           // Install the dependency if not already in shop
-          try {
+          var install_disrupted = false
+          var do_install = function() {
             shop.get(dep_locator)
             shop.extract(dep_locator)
-          } catch (e) {
-            log.console(`  Warning: Could not install dependency ${dep_locator}: ${e.message}`)
-            log.error(e)
+          } disruption {
+            install_disrupted = true
+          }
+          do_install()
+          if (install_disrupted) {
+            log.console(`  Warning: Could not install dependency ${dep_locator}`)
           }
         })
       }
-    } catch (e) {
+    } disruption {
+      read_deps_disrupted = true
+    }
+    do_read_deps()
+    if (read_deps_disrupted) {
       log.console(`  Warning: Could not read dependencies from ${toml_path}`)
     }
   }
@@ -218,7 +234,9 @@ Link.sync_all = function(shop) {
 
   arrfor(array(links), function(canonical) {
     var target = links[canonical]
-    try {
+    var sync_disrupted = false
+    var sync_error_msg = ""
+    var do_sync = function() {
       // Validate target exists
       var link_target = resolve_link_target(target)
       if (!fd.is_dir(link_target)) {
@@ -234,7 +252,8 @@ Link.sync_all = function(shop) {
 
       // Install dependencies of the linked package
       var toml_path = link_target + '/cell.toml'
-      try {
+      var read_deps_disrupted = false
+      var do_read_deps = function() {
         var content = text(fd.slurp(toml_path))
         var cfg = toml.decode(content)
         if (cfg.dependencies) {
@@ -245,21 +264,25 @@ Link.sync_all = function(shop) {
               return
             }
             // Install the dependency if not already in shop
-            try {
+            var install_dep = function() {
               shop.get(dep_locator)
               shop.extract(dep_locator)
-            } catch (e) {
-              // Silently continue - dependency may already be installed
-            }
+            } disruption {}
+            install_dep()
           })
         }
-      } catch (e) {
-        // Could not read dependencies - continue anyway
+      } disruption {
+        read_deps_disrupted = true
       }
+      do_read_deps()
 
       count++
-    } catch (e) {
-      push(errors, canonical + ': ' + e.message)
+    } disruption {
+      sync_disrupted = true
+    }
+    do_sync()
+    if (sync_disrupted) {
+      push(errors, canonical + ': sync failed')
     }
   })
 

package.cm

@@ -51,7 +51,8 @@ package.load_config = function(name)
     return config_cache[config_path]
 
   if (!fd.is_file(config_path)) {
-    throw Error(`${config_path} does not exist`)
+    log.error(`${config_path} does not exist`)
+    disrupt
   }
 
   var content = text(fd.slurp(config_path))
@@ -158,19 +159,20 @@ package.split_alias = function(name, path)
   var parts = array(path, '/')
   var first_part = parts[0]
 
-  try {
+  var split_result = null
+  var do_split = function() {
     var config = package.load_config(name)
-    if (!config) return null
+    if (!config) return
 
     var deps = config.dependencies
     if (deps && deps[first_part]) {
       var dep_locator = deps[first_part]
       var remaining_path = text(array(parts, 1), '/')
-      return { package: dep_locator, path: remaining_path }
-    }
-  } catch (e) {
-    // Config doesn't exist or couldn't be loaded
+      split_result = { package: dep_locator, path: remaining_path }
     }
+  } disruption {}
+  do_split()
+  if (split_result) return split_result
 
   return null
 }

pronto.cm

@@ -3,6 +3,8 @@
 // Based on Douglas Crockford's parseq, adapted for Cell.
 // Time is in seconds.
 
+function safe_call(fn, arg) { fn(arg) } disruption {}
+
 function make_reason(factory, excuse, evidence) {
   def reason = Error(`pronto.${factory}${excuse ? ': ' + excuse : ''}`)
   reason.evidence = evidence
@@ -15,12 +17,12 @@ function is_requestor(fn) {
 
 function check_requestors(list, factory) {
   if (!is_array(list) || some(list, r => !is_requestor(r)))
-    throw make_reason(factory, 'Bad requestor array.', list)
+    disrupt
 }
 
 function check_callback(cb, factory) {
   if (!is_function(cb) || length(cb) != 2)
-    throw make_reason(factory, 'Not a callback.', cb)
+    disrupt
 }
 
 // fallback(requestor_array)
@@ -28,7 +30,7 @@ function check_callback(cb, factory) {
 function fallback(requestor_array) {
   def factory = 'fallback'
   if (!is_array(requestor_array) || length(requestor_array) == 0)
-    throw make_reason(factory, 'Empty requestor array.')
+    disrupt
   check_requestors(requestor_array, factory)
 
   return function fallback_requestor(callback, value) {
@@ -40,7 +42,7 @@ function fallback(requestor_array) {
     function cancel(reason) {
       cancelled = true
       if (current_cancel) {
-        try { current_cancel(reason) } catch (_) {}
+        safe_call(current_cancel, reason)
         current_cancel = null
       }
     }
@@ -55,7 +57,8 @@ function fallback(requestor_array) {
       def requestor = requestor_array[index]
       index += 1
 
-      try {
+      var requestor_disrupted = false
+      var start_requestor = function() {
         current_cancel = requestor(function(val, reason) {
           if (cancelled) return
           current_cancel = null
@@ -65,7 +68,11 @@ function fallback(requestor_array) {
             try_next()
           }
         }, value)
-      } catch (ex) {
+      } disruption {
+        requestor_disrupted = true
+      }
+      start_requestor()
+      if (requestor_disrupted) {
         try_next()
       }
     }
@@ -80,7 +87,7 @@ function fallback(requestor_array) {
 function parallel(requestor_array, throttle, need) {
   def factory = 'parallel'
   if (!is_array(requestor_array))
-    throw make_reason(factory, 'Not an array.', requestor_array)
+    disrupt
   check_requestors(requestor_array, factory)
 
   def length = length(requestor_array)
@@ -89,10 +96,10 @@ function parallel(requestor_array, throttle, need) {
 
   if (need == null) need = length
   if (!is_number(need) || need < 0 || need > length)
-    throw make_reason(factory, 'Bad need.', need)
+    disrupt
 
   if (throttle != null && (!is_number(throttle) || throttle < 1))
-    throw make_reason(factory, 'Bad throttle.', throttle)
+    disrupt
 
   return function parallel_requestor(callback, value) {
     check_callback(callback, factory)
@@ -107,7 +114,8 @@ function parallel(requestor_array, throttle, need) {
       if (finished) return
       finished = true
       arrfor(cancel_list, c => {
-        try { if (is_function(c)) c(reason) } catch (_) {}
+        var do_cancel = function() { if (is_function(c)) c(reason) } disruption {}
+        do_cancel()
       })
     }
 
@@ -117,7 +125,9 @@ function parallel(requestor_array, throttle, need) {
       next_index += 1
       def requestor = requestor_array[idx]
 
-      try {
+      var requestor_disrupted = false
+      var requestor_ex = null
+      var run_requestor = function() {
         cancel_list[idx] = requestor(function(val, reason) {
           if (finished) return
           cancel_list[idx] = null
@@ -142,11 +152,15 @@ function parallel(requestor_array, throttle, need) {
 
           start_one()
         }, value)
-      } catch (ex) {
+      } disruption {
+        requestor_disrupted = true
+      }
+      run_requestor()
+      if (requestor_disrupted) {
         failures += 1
         if (failures > length - need) {
-          cancel(ex)
-          callback(null, ex)
+          cancel(requestor_ex)
+          callback(null, requestor_ex)
           return
         }
         start_one()
@@ -166,16 +180,16 @@ function parallel(requestor_array, throttle, need) {
 function race(requestor_array, throttle, need) {
   def factory = 'race'
   if (!is_array(requestor_array) || length(requestor_array) == 0)
-    throw make_reason(factory, 'Empty requestor array.')
+    disrupt
   check_requestors(requestor_array, factory)
 
   def length = length(requestor_array)
   if (need == null) need = 1
   if (!is_number(need) || need < 1 || need > length)
-    throw make_reason(factory, 'Bad need.', need)
+    disrupt
 
   if (throttle != null && (!is_number(throttle) || throttle < 1))
-    throw make_reason(factory, 'Bad throttle.', throttle)
+    disrupt
 
   return function race_requestor(callback, value) {
     check_callback(callback, factory)
@@ -190,7 +204,8 @@ function race(requestor_array, throttle, need) {
       if (finished) return
       finished = true
       arrfor(cancel_list, c => {
-        try { if (is_function(c)) c(reason) } catch (_) {}
+        var do_cancel = function() { if (is_function(c)) c(reason) } disruption {}
+        do_cancel()
       })
     }
 
@@ -200,7 +215,9 @@ function race(requestor_array, throttle, need) {
       next_index += 1
       def requestor = requestor_array[idx]
 
-      try {
+      var requestor_disrupted = false
+      var requestor_ex = null
+      var run_requestor = function() {
         cancel_list[idx] = requestor(function(val, reason) {
           if (finished) return
           cancel_list[idx] = null
@@ -228,11 +245,15 @@ function race(requestor_array, throttle, need) {
 
           start_one()
         }, value)
-      } catch (ex) {
+      } disruption {
+        requestor_disrupted = true
+      }
+      run_requestor()
+      if (requestor_disrupted) {
         failures += 1
         if (failures > length - need) {
-          cancel(ex)
-          callback(null, ex)
+          cancel(requestor_ex)
+          callback(null, requestor_ex)
           return
         }
         start_one()
@@ -251,7 +272,7 @@ function race(requestor_array, throttle, need) {
 function sequence(requestor_array) {
   def factory = 'sequence'
   if (!is_array(requestor_array))
-    throw make_reason(factory, 'Not an array.', requestor_array)
+    disrupt
   check_requestors(requestor_array, factory)
 
   if (length(requestor_array) == 0)
@@ -266,7 +287,7 @@ function sequence(requestor_array) {
     function cancel(reason) {
       cancelled = true
       if (current_cancel) {
-        try { current_cancel(reason) } catch (_) {}
+        safe_call(current_cancel, reason)
         current_cancel = null
       }
     }
@@ -281,7 +302,9 @@ function sequence(requestor_array) {
       def requestor = requestor_array[index]
       index += 1
 
-      try {
+      var requestor_disrupted = false
+      var requestor_ex = null
+      var run_requestor = function() {
         current_cancel = requestor(function(result, reason) {
           if (cancelled) return
           current_cancel = null
@@ -291,8 +314,12 @@ function sequence(requestor_array) {
             run_next(result)
           }
         }, val)
-      } catch (ex) {
-        callback(null, ex)
+      } disruption {
+        requestor_disrupted = true
+      }
+      run_requestor()
+      if (requestor_disrupted) {
+        callback(null, requestor_ex)
       }
     }
 
@@ -306,15 +333,21 @@ function sequence(requestor_array) {
 function requestorize(unary) {
   def factory = 'requestorize'
   if (!is_function(unary))
-    throw make_reason(factory, 'Not a function.', unary)
+    disrupt
 
   return function requestorized(callback, value) {
     check_callback(callback, factory)
-    try {
+    var call_disrupted = false
+    var call_ex = null
+    var do_call = function() {
       def result = unary(value)
       callback(result == null ? true : result)
-    } catch (ex) {
-      callback(null, ex)
+    } disruption {
+      call_disrupted = true
+    }
+    do_call()
+    if (call_disrupted) {
+      callback(null, call_ex)
     }
   }
 }

source/cell.c

@@ -210,31 +210,54 @@ void script_startup(cell_rt *prt)
     return;
   }
 
-  // Create hidden environment
-  JSValue hidden_env = JS_NewObject(js);
-  JS_SetPropertyStr(js, hidden_env, "os", js_os_use(js));
-  JS_SetPropertyStr(js, hidden_env, "json", js_json_use(js));
-  JS_SetPropertyStr(js, hidden_env, "nota", js_nota_use(js));
-  JS_SetPropertyStr(js, hidden_env, "wota", js_wota_use(js));
+  // Create hidden environment (GC-protected to survive allocations)
+  JSGCRef env_ref;
+  JS_PushGCRef(js, &env_ref);
+  env_ref.val = JS_NewObject(js);
+
+  // Create modules with GC rooting
+  JSGCRef os_ref, json_ref, nota_ref, wota_ref;
+  JS_PushGCRef(js, &os_ref);
+  JS_PushGCRef(js, &json_ref);
+  JS_PushGCRef(js, &nota_ref);
+  JS_PushGCRef(js, &wota_ref);
+
+  os_ref.val = js_os_use(js);
+  json_ref.val = js_json_use(js);
+  nota_ref.val = js_nota_use(js);
+  wota_ref.val = js_wota_use(js);
+
+  // Set properties on env (SetPropertyStr internally roots its args)
+  JS_SetPropertyStr(js, env_ref.val, "os", os_ref.val);
+  JS_SetPropertyStr(js, env_ref.val, "json", json_ref.val);
+  JS_SetPropertyStr(js, env_ref.val, "nota", nota_ref.val);
+  JS_SetPropertyStr(js, env_ref.val, "wota", wota_ref.val);
+
+  JS_PopGCRef(js, &wota_ref);
+  JS_PopGCRef(js, &nota_ref);
+  JS_PopGCRef(js, &json_ref);
+  JS_PopGCRef(js, &os_ref);
 
   crt->actor_sym_ref.val = JS_NewObject(js);
-  JS_SetPropertyStr(js, hidden_env, "actorsym", JS_DupValue(js, crt->actor_sym_ref.val));
+  JS_SetPropertyStr(js, env_ref.val, "actorsym", JS_DupValue(js, crt->actor_sym_ref.val));
 
-  // Always set init (even if null)
   if (crt->init_wota) {
-    JS_SetPropertyStr(js, hidden_env, "init", wota2value(js, crt->init_wota));
+    JSValue init_val = wota2value(js, crt->init_wota);
+    JS_SetPropertyStr(js, env_ref.val, "init", init_val);
     free(crt->init_wota);
     crt->init_wota = NULL;
   } else {
-    JS_SetPropertyStr(js, hidden_env, "init", JS_NULL);
+    JS_SetPropertyStr(js, env_ref.val, "init", JS_NULL);
   }
 
   if (core_path) {
-    JS_SetPropertyStr(js, hidden_env, "core_path", JS_NewString(js, core_path));
+    JSValue path_val = JS_NewString(js, core_path);
+    JS_SetPropertyStr(js, env_ref.val, "core_path", path_val);
   }
 
   // Stone the environment
-  hidden_env = JS_Stone(js, hidden_env);
+  JSValue hidden_env = JS_Stone(js, env_ref.val);
+  JS_PopGCRef(js, &env_ref);
 
   // Run through MACH VM
   crt->state = ACTOR_RUNNING;

test.ce

@@ -29,12 +29,13 @@ function is_valid_package(dir) {
 // Get current package name from cell.toml or null
 function get_current_package_name() {
     if (!is_valid_package('.')) return null
-    try {
+    var pkg_name = 'local'
+    var do_load = function() {
         var config = pkg.load_config(null)
-        return config.package || 'local'
-    } catch (e) {
-        return 'local'
-    }
+        if (config.package) pkg_name = config.package
+    } disruption {}
+    do_load()
+    return pkg_name
 }
 
 // Parse arguments
@@ -229,21 +230,48 @@ function spawn_actor_test(test_info) {
         actor: null
     }
 
-    try {
+    var spawn_disrupted = false
+    var do_spawn = function() {
         // Spawn the actor test - it should send back results
         var actor_path = text(test_info.path, 0, -3) // remove .ce
         entry.actor = $start(actor_path)
         push(pending_actor_tests, entry)
-    } catch (e) {
+    } disruption {
+        spawn_disrupted = true
+    }
+    do_spawn()
+    if (spawn_disrupted) {
         entry.status = "failed"
-        entry.error = { message: `Failed to spawn actor: ${e}` }
+        entry.error = { message: `Failed to spawn actor: ${test_name}` }
         entry.duration_ns = 0
         push(actor_test_results, entry)
-        log.console(`    FAIL ${test_name}: `)
-        log.error(e)
+        log.console(`    FAIL ${test_name}`)
     }
 }
 
+// Test runner with disruption support
+var test_passed = true
+var test_error_msg = ""
+var test_error_stack = ""
+
+var run_test = function(fn) {
+    test_passed = true
+    test_error_msg = ""
+    test_error_stack = ""
+    var ret = fn()
+    if (is_text(ret)) {
+        test_passed = false
+        test_error_msg = ret
+    } else if (ret && (is_text(ret.message) || is_proto(ret, Error))) {
+        test_passed = false
+        test_error_msg = ret.message || text(ret)
+        if (ret.stack) test_error_stack = ret.stack
+    }
+} disruption {
+    test_passed = false
+    if (test_error_msg == "") test_error_msg = "test disrupted"
+}
+
 function run_tests(package_name, specific_test) {
     var prefix = get_pkg_dir(package_name)
     var tests_dir = prefix + '/tests'
@@ -293,7 +321,9 @@ function run_tests(package_name, specific_test) {
             failed: 0
         }
 
-        try {
+        var load_disrupted = false
+        var load_error_msg = ""
+        var do_load = function() {
             var test_mod
             // For local packages (null), use the current directory as package context
             var use_pkg = package_name ? package_name : fd.realpath('.')
@@ -322,34 +352,23 @@ function run_tests(package_name, specific_test) {
                     }
 
                     var start_time = time.number()
-                    try {
-                        var ret = t.fn()
-
-                        if (is_text(ret)) {
-                             throw Error(ret)
-                        } else if (ret && (is_text(ret.message) || is_proto(ret, Error))) {
-                             throw ret
-                        }
+                    run_test(t.fn)
 
+                    if (test_passed) {
                         test_entry.status = "passed"
                         log.console(`    PASS  ${t.name}`)
                         pkg_result.passed++
                         file_result.passed++
-                    } catch (e) {
+                    } else {
                         test_entry.status = "failed"
                         test_entry.error = {
-                            message: e,
-                            stack: e.stack || ""
+                            message: test_error_msg
                         }
-                        if (e.name) test_entry.error.name = e.name
+                        if (test_error_stack) test_entry.error.stack = test_error_stack
 
-                        if (is_object(e) && e.message) {
-                             test_entry.error.message = e.message
-                        }
-
-                        log.console(`    FAIL ${t.name} ${test_entry.error.message}`)
-                        if (test_entry.error.stack) {
-                             log.console(`      ${text(array(test_entry.error.stack, '\n'), '\n      ')}`)
+                        log.console(`    FAIL ${t.name} ${test_error_msg}`)
+                        if (test_error_stack) {
+                             log.console(`      ${text(array(test_error_stack, '\n'), '\n      ')}`)
                         }
 
                         pkg_result.failed++
@@ -365,15 +384,18 @@ function run_tests(package_name, specific_test) {
                     }
                 }
             }
-
-        } catch (e) {
-            log.console(`  Error loading ${f}: ${e}`)
+        } disruption {
+            load_disrupted = true
+        }
+        do_load()
+        if (load_disrupted) {
+            log.console(`  Error loading ${f}`)
             var test_entry = {
                 package: pkg_result.package,
                 test: "load_module",
                 status: "failed",
                 duration_ns: 0,
-                error: { message: `Error loading module: ${e}` }
+                error: { message: `Error loading module: ${f}` }
             }
             push(file_result.tests, test_entry)
             pkg_result.failed++

tests/blob.cm

@@ -4,25 +4,32 @@ var os = use('os');
 
 function assert(condition, message) {
     if (!condition) {
-        throw Error(message || "Assertion failed");
+        return message || "Assertion failed"
     }
 }
 
 function assertEqual(actual, expected, message) {
     if (actual != expected) {
-        throw Error(message || "Expected " + expected + ", got " + actual);
+        return message || "Expected " + expected + ", got " + actual
     }
 }
 
+function should_disrupt(fn) {
+    var caught = false
+    var wrapper = function() { fn() } disruption { caught = true }
+    wrapper()
+    return caught
+}
+
 return {
     test_create_empty_blob: function() {
         var b = Blob();
-        assertEqual(length(b), 0, "Empty blob should have length 0");
+        return assertEqual(length(b), 0, "Empty blob should have length 0")
     },
 
     test_create_blob_with_capacity: function() {
         var b = Blob(100);
-        assertEqual(length(b), 0, "New blob with capacity should still have length 0");
+        return assertEqual(length(b), 0, "New blob with capacity should still have length 0")
     },
 
     test_write_and_read_single_bit: function() {
@@ -31,13 +38,17 @@ return {
         b.write_bit(false);
         b.write_bit(1);
         b.write_bit(0);
-        assertEqual(length(b), 4, "Should have 4 bits after writing");
+        var r = assertEqual(length(b), 4, "Should have 4 bits after writing")
+        if (r) return r
 
         stone(b);
-        assertEqual(b.read_logical(0), true, "First bit should be true");
-        assertEqual(b.read_logical(1), false, "Second bit should be false");
-        assertEqual(b.read_logical(2), true, "Third bit should be true (1)");
-        assertEqual(b.read_logical(3), false, "Fourth bit should be false (0)");
+        r = assertEqual(b.read_logical(0), true, "First bit should be true")
+        if (r) return r
+        r = assertEqual(b.read_logical(1), false, "Second bit should be false")
+        if (r) return r
+        r = assertEqual(b.read_logical(2), true, "Third bit should be true (1)")
+        if (r) return r
+        return assertEqual(b.read_logical(3), false, "Fourth bit should be false (0)")
     },
 
     test_out_of_range_read_throws_error: function() {
@@ -45,21 +56,11 @@ return {
         b.write_bit(true);
         stone(b);
 
-        var threw = false;
-        try {
-            b.read_logical(100);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "Out of range read should throw");
+        if (!should_disrupt(function() { b.read_logical(100) }))
+            return "Out of range read should disrupt"
 
-        threw = false;
-        try {
-            b.read_logical(-1);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "Negative index read should throw");
+        if (!should_disrupt(function() { b.read_logical(-1) }))
+            return "Negative index read should disrupt"
     },
 
     test_write_and_read_numbers: function() {
@@ -70,10 +71,13 @@ return {
         b.write_number(1e20);
         stone(b);
 
-        assertEqual(b.read_number(0), 3.14159, "First number should match");
-        assertEqual(b.read_number(64), -42, "Second number should match");
-        assertEqual(b.read_number(128), 0, "Third number should match");
-        assertEqual(b.read_number(192), 1e20, "Fourth number should match");
+        var r = assertEqual(b.read_number(0), 3.14159, "First number should match")
+        if (r) return r
+        r = assertEqual(b.read_number(64), -42, "Second number should match")
+        if (r) return r
+        r = assertEqual(b.read_number(128), 0, "Third number should match")
+        if (r) return r
+        return assertEqual(b.read_number(192), 1e20, "Fourth number should match")
     },
 
     test_write_and_read_text: function() {
@@ -83,7 +87,7 @@ return {
         b.write_text("🎉");
         stone(b);
 
-        assertEqual(b.read_text(0), "Hello", "First text should match");
+        return assertEqual(b.read_text(0), "Hello", "First text should match")
     },
 
     test_write_and_read_blobs: function() {
@@ -95,13 +99,17 @@ return {
         var b2 = Blob(10);
         b2.write_blob(b1);
         b2.write_bit(false);
-        assertEqual(length(b2), 4, "Combined blob should have 4 bits");
+        var r = assertEqual(length(b2), 4, "Combined blob should have 4 bits")
+        if (r) return r
 
         stone(b2);
-        assertEqual(b2.read_logical(0), true);
-        assertEqual(b2.read_logical(1), false);
-        assertEqual(b2.read_logical(2), true);
-        assertEqual(b2.read_logical(3), false);
+        r = assertEqual(b2.read_logical(0), true)
+        if (r) return r
+        r = assertEqual(b2.read_logical(1), false)
+        if (r) return r
+        r = assertEqual(b2.read_logical(2), true)
+        if (r) return r
+        return assertEqual(b2.read_logical(3), false)
     },
 
     test_blob_copy_constructor: function() {
@@ -114,9 +122,11 @@ return {
 
         var b2 = Blob(b1);
         stone(b2);
-        assertEqual(length(b2), 4, "Copied blob should have same length");
-        assertEqual(b2.read_logical(0), true);
-        assertEqual(b2.read_logical(3), true);
+        var r = assertEqual(length(b2), 4, "Copied blob should have same length")
+        if (r) return r
+        r = assertEqual(b2.read_logical(0), true)
+        if (r) return r
+        return assertEqual(b2.read_logical(3), true)
     },
 
     test_blob_partial_copy_constructor: function() {
@@ -128,9 +138,11 @@ return {
 
         var b2 = Blob(b1, 2, 7);
         stone(b2);
-        assertEqual(length(b2), 5, "Partial copy should have 5 bits");
-        assertEqual(b2.read_logical(0), true);
-        assertEqual(b2.read_logical(2), true);
+        var r = assertEqual(length(b2), 5, "Partial copy should have 5 bits")
+        if (r) return r
+        r = assertEqual(b2.read_logical(0), true)
+        if (r) return r
+        return assertEqual(b2.read_logical(2), true)
     },
 
     test_create_blob_with_fill: function() {
@@ -141,8 +153,10 @@ return {
         stone(b2);
 
         for (var i = 0; i < 8; i++) {
-            assertEqual(b1.read_logical(i), true, "Bit " + i + " should be true");
-            assertEqual(b2.read_logical(i), false, "Bit " + i + " should be false");
+            var r = assertEqual(b1.read_logical(i), true, "Bit " + i + " should be true")
+            if (r) return r
+            r = assertEqual(b2.read_logical(i), false, "Bit " + i + " should be false")
+            if (r) return r
         }
     },
 
@@ -156,7 +170,8 @@ return {
 
         stone(b);
         for (var i = 0; i < 5; i++) {
-            assertEqual(b.read_logical(i), sequence[i], "Bit " + i + " should match sequence");
+            var r = assertEqual(b.read_logical(i), sequence[i], "Bit " + i + " should match sequence")
+            if (r) return r
         }
     },
 
@@ -167,11 +182,13 @@ return {
         b.write_bit(true);
         b.write_pad(8);
 
-        assertEqual(length(b), 8, "Should be padded to 8 bits");
+        var r = assertEqual(length(b), 8, "Should be padded to 8 bits")
+        if (r) return r
         stone(b);
 
-        assert(b['pad?'](3, 8), "Should detect valid padding at position 3");
-        assert(!b['pad?'](2, 8), "Should detect invalid padding at position 2");
+        r = assert(b['pad?'](3, 8), "Should detect valid padding at position 3")
+        if (r) return r
+        return assert(!b['pad?'](2, 8), "Should detect invalid padding at position 2")
     },
 
     test_read_blob_from_stone_blob: function() {
@@ -183,10 +200,12 @@ return {
 
         var b2 = b1.read_blob(4, 12);
         stone(b2);
-        assertEqual(length(b2), 8, "Read blob should have 8 bits");
+        var r = assertEqual(length(b2), 8, "Read blob should have 8 bits")
+        if (r) return r
 
-        assertEqual(b2.read_logical(2), true);
-        assertEqual(b2.read_logical(5), true);
+        r = assertEqual(b2.read_logical(2), true)
+        if (r) return r
+        return assertEqual(b2.read_logical(5), true)
     },
 
     test_stone_blob_is_immutable: function() {
@@ -194,35 +213,28 @@ return {
         b.write_bit(true);
         stone(b);
 
-        var threw = false;
-        try {
-            b.write_bit(false);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "Writing to stone blob should throw error");
+        if (!should_disrupt(function() { b.write_bit(false) }))
+            return "Writing to stone blob should disrupt"
     },
 
     test_multiple_stone_calls_are_safe: function() {
         var b = Blob();
         b.write_bit(true);
-        assert(!stone.p(b), "Blob should not be a stone before stone() call");
+        var r = assert(!stone.p(b), "Blob should not be a stone before stone() call")
+        if (r) return r
         stone(b);
-        assert(stone.p(b), "Blob should be a stone after stone() call");
+        r = assert(stone.p(b), "Blob should be a stone after stone() call")
+        if (r) return r
         stone(b);
-        assertEqual(b.read_logical(0), true, "Blob data should remain intact");
+        r = assertEqual(b.read_logical(0), true, "Blob data should remain intact")
+        if (r) return r
 
-        assert(b.stone == null, "blob.stone should not be available as a method");
+        return assert(b.stone == null, "blob.stone should not be available as a method")
     },
 
     test_invalid_constructor_arguments: function() {
-        var threw = false;
-        try {
-            var b = Blob("invalid");
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "Invalid constructor arguments should throw");
+        if (!should_disrupt(function() { Blob("invalid") }))
+            return "Invalid constructor arguments should disrupt"
     },
 
     test_write_bit_validation: function() {
@@ -230,13 +242,8 @@ return {
         b.write_bit(0);
         b.write_bit(1);
 
-        var threw = false;
-        try {
-            b.write_bit(2);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "write_bit with value 2 should throw");
+        if (!should_disrupt(function() { b.write_bit(2) }))
+            return "write_bit with value 2 should disrupt"
     },
 
     test_complex_data_round_trip: function() {
@@ -253,15 +260,17 @@ return {
 
         var b2 = Blob(b);
         stone(b2);
-        assertEqual(length(b2), originalLength, "Copy should have same length");
-        assertEqual(b2.read_text(0), "Test", "First text should match");
+        var r = assertEqual(length(b2), originalLength, "Copy should have same length")
+        if (r) return r
+        return assertEqual(b2.read_text(0), "Test", "First text should match")
     },
 
     test_zero_capacity_blob: function() {
         var b = Blob(0);
-        assertEqual(length(b), 0, "Zero capacity blob should have length 0");
+        var r = assertEqual(length(b), 0, "Zero capacity blob should have length 0")
+        if (r) return r
         b.write_bit(true);
-        assertEqual(length(b), 1, "Should expand when writing");
+        return assertEqual(length(b), 1, "Should expand when writing")
     },
 
     test_large_blob_handling: function() {
@@ -272,13 +281,17 @@ return {
             b.write_bit(i % 7 == 0);
         }
 
-        assertEqual(length(b), testSize, "Should have " + testSize + " bits");
+        var r = assertEqual(length(b), testSize, "Should have " + testSize + " bits")
+        if (r) return r
         stone(b);
 
-        assertEqual(b.read_logical(0), true, "Bit 0 should be true");
-        assertEqual(b.read_logical(7), true, "Bit 7 should be true");
-        assertEqual(b.read_logical(14), true, "Bit 14 should be true");
-        assertEqual(b.read_logical(15), false, "Bit 15 should be false");
+        r = assertEqual(b.read_logical(0), true, "Bit 0 should be true")
+        if (r) return r
+        r = assertEqual(b.read_logical(7), true, "Bit 7 should be true")
+        if (r) return r
+        r = assertEqual(b.read_logical(14), true, "Bit 14 should be true")
+        if (r) return r
+        return assertEqual(b.read_logical(15), false, "Bit 15 should be false")
     },
 
     test_non_stone_blob_read_methods_should_throw: function() {
@@ -287,52 +300,27 @@ return {
         b.write_number(42);
         b.write_text("test");
 
-        var threw = false;
-        try {
-            b.read_logical(0);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "read_logical on non-stone blob should throw");
+        if (!should_disrupt(function() { b.read_logical(0) }))
+            return "read_logical on non-stone blob should disrupt"
 
-        threw = false;
-        try {
-            b.read_number(0);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "read_number on non-stone blob should throw");
+        if (!should_disrupt(function() { b.read_number(0) }))
+            return "read_number on non-stone blob should disrupt"
 
-        threw = false;
-        try {
-            b.read_text(0);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "read_text on non-stone blob should throw");
+        if (!should_disrupt(function() { b.read_text(0) }))
+            return "read_text on non-stone blob should disrupt"
 
-        threw = false;
-        try {
-            b.read_blob(0, 10);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "read_blob on non-stone blob should throw");
+        if (!should_disrupt(function() { b.read_blob(0, 10) }))
+            return "read_blob on non-stone blob should disrupt"
 
-        threw = false;
-        try {
-            b['pad?'](0, 8);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "pad? on non-stone blob should throw");
+        if (!should_disrupt(function() { b['pad?'](0, 8) }))
+            return "pad? on non-stone blob should disrupt"
     },
 
     test_empty_text_write_and_read: function() {
         var b = Blob();
         b.write_text("");
         stone(b);
-        assertEqual(b.read_text(0), "", "Empty string should round-trip");
+        return assertEqual(b.read_text(0), "", "Empty string should round-trip")
     },
 
     test_invalid_read_positions: function() {
@@ -340,20 +328,10 @@ return {
         b.write_number(42);
         stone(b);
 
-        var threw = false;
-        try {
-            b.read_number(-10);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "Negative position should throw");
+        if (!should_disrupt(function() { b.read_number(-10) }))
+            return "Negative position should disrupt"
 
-        threw = false;
-        try {
-            b.read_number(1000);
-        } catch (e) {
-            threw = true;
-        }
-        assert(threw, "Position beyond length should throw");
+        if (!should_disrupt(function() { b.read_number(1000) }))
+            return "Position beyond length should disrupt"
     }
 }

tests/disrupt.cm

@@ -1,5 +1,5 @@
 return {
     test_disrupt: function() {
-        throw 1
+        disrupt
     }
 }

tests/miniz.cm

@@ -2,6 +2,8 @@ var fd = use("fd")
 var miniz = use("miniz")
 var utf8 = use("utf8")
 
+function safe_unlink(p) { fd.unlink(p) } disruption {}
+
 return {
     create_and_read_zip: function() {
         var ZIP_PATH = "miniz_test.zip"
@@ -15,7 +17,8 @@ return {
           fd.close(handle)
         }
 
-        try {
+        var error_msg = null
+        var do_test = function() {
           write_text_file(SOURCE_PATH, PAYLOAD)
           var source_blob = fd.slurp(SOURCE_PATH)
           var writer = miniz.write(ZIP_PATH)
@@ -26,17 +29,22 @@ return {
           var reader = miniz.read(zip_blob)
 
           if (!reader.exists(ENTRY_PATH))
-            throw "entry missing in archive"
+            error_msg = "entry missing in archive"
 
+          if (!error_msg) {
             var extracted_blob = reader.slurp(ENTRY_PATH)
             var extracted_text = utf8.decode(extracted_blob)
 
             if (extracted_text != PAYLOAD)
-            throw "extracted text mismatch"
-        } finally {
-           try { fd.unlink(ZIP_PATH) } catch(e) {}
-           try { fd.unlink(SOURCE_PATH) } catch(e) {}
+              error_msg = "extracted text mismatch"
           }
+        } disruption {
+          if (!error_msg) error_msg = "test disrupted"
+        }
+        do_test()
+        safe_unlink(ZIP_PATH)
+        safe_unlink(SOURCE_PATH)
+        if (error_msg) return error_msg
     },
 
     list_and_count: function() {
@@ -44,7 +52,8 @@ return {
         var ENTRY1 = "file1.txt"
         var ENTRY2 = "dir/file2.txt"
 
-        try {
+        var error_msg = null
+        var do_test = function() {
           var writer = miniz.write(ZIP_PATH)
           writer.add_file(ENTRY1, utf8.encode("content1"))
           writer.add_file(ENTRY2, utf8.encode("content2"))
@@ -55,19 +64,23 @@ return {
 
           var listed = reader.list()
           if (length(listed) != reader.count())
-            throw "list/count mismatch"
-          if (length(listed) != 2)
-            throw "unexpected entry count"
-        } finally {
-           try { fd.unlink(ZIP_PATH) } catch(e) {}
+            error_msg = "list/count mismatch"
+          if (!error_msg && length(listed) != 2)
+            error_msg = "unexpected entry count"
+        } disruption {
+          if (!error_msg) error_msg = "test disrupted"
         }
+        do_test()
+        safe_unlink(ZIP_PATH)
+        if (error_msg) return error_msg
     },
 
     exists_check: function() {
         var ZIP_PATH = "miniz_exists_test.zip"
         var ENTRY_PATH = "existing.txt"
 
-        try {
+        var error_msg = null
+        var do_test = function() {
           var writer = miniz.write(ZIP_PATH)
           writer.add_file(ENTRY_PATH, utf8.encode("data"))
           writer = null
@@ -76,11 +89,14 @@ return {
           var reader = miniz.read(zip_blob)
 
           if (!reader.exists(ENTRY_PATH))
-            throw "existing entry not found"
-          if (reader.exists("nonexistent.txt"))
-            throw "nonexistent entry reported as existing"
-        } finally {
-           try { fd.unlink(ZIP_PATH) } catch(e) {}
-        }
+            error_msg = "existing entry not found"
+          if (!error_msg && reader.exists("nonexistent.txt"))
+            error_msg = "nonexistent entry reported as existing"
+        } disruption {
+          if (!error_msg) error_msg = "test disrupted"
+        }
+        do_test()
+        safe_unlink(ZIP_PATH)
+        if (error_msg) return error_msg
     }
 }

tests/underling_actor.ce

@@ -1,7 +1,7 @@
 var cmds = {
   stop: $stop,
   disrupt: _ => {
-    $delay(_ => { throw Error() }, 0.5)
+    $delay(_ => { disrupt }, 0.5)
   }
 }
 

tests/use.cm

@@ -1,5 +1,10 @@
-try {
+var load_disrupted = false
+var do_load = function() {
   var u = use('tests/use')
-} catch(e) {
-  log.console(e)
+} disruption {
+  load_disrupted = true
+}
+do_load()
+if (load_disrupted) {
+  log.console("use self-load disrupted")
 }