diff --git a/scripts/build.ce b/scripts/build.ce
index 2f614672..d08726e5 100644
--- a/scripts/build.ce
+++ b/scripts/build.ce
@@ -71,11 +71,9 @@ for (var i = 0; i < args.length; i++) {
 }
 
 // Resolve target
-target = build.resolve_target(target)
-if (target) {
-  log.console("Building for target: " + target)
-} else {
-  log.console("Building for host platform")
+if (target && !build.has_target(target)) {
+  log.console("Available targets: " + targets.join(', '))
+  throw new Error("Invalid target: " + target)
 }
 
 // Find cell package - it should be at ~/work/cell or a dependency
diff --git a/scripts/build.cm b/scripts/build.cm
index e2418ba2..cc60463e 100644
--- a/scripts/build.cm
+++ b/scripts/build.cm
@@ -7,7 +7,6 @@ var utf8 = use('utf8')
 var os_mod = use('os')
 
 var Build = {}
-
 // Embedded cross-compilation toolchain configurations
 Build.toolchains = {
   playdate: {
@@ -94,13 +93,220 @@ Build.toolchains = {
     c_args: [],
     c_link_args: []
   },
+  macos_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-macos11',
+      cpp: 'clang++ -target arm64-apple-macos11',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'darwin',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk']
+  },
+  macos_x86_64: {
+    binaries: {
+      c: 'clang -target x86_64-apple-macos10.12',
+      cpp: 'clang++ -target x86_64-apple-macos10.12',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'darwin',
+      cpu_family: 'x86_64',
+      cpu: 'x86_64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk']
+  },
+  ios_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-ios12.0',
+      cpp: 'clang++ -target arm64-apple-ios12.0',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'ios',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk', '-fembed-bitcode'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk', '-fembed-bitcode']
+  },
+  ios_simulator_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-ios12.0-simulator',
+      cpp: 'clang++ -target arm64-apple-ios12.0-simulator',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'ios',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk']
+  },
+  ios_simulator_x86_64: {
+    binaries: {
+      c: 'clang -target x86_64-apple-ios12.0-simulator',
+      cpp: 'clang++ -target x86_64-apple-ios12.0-simulator',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'ios',
+      cpu_family: 'x86_64',
+      cpu: 'x86_64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk']
+  },
+  tvos_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-tvos12.0',
+      cpp: 'clang++ -target arm64-apple-tvos12.0',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'tvos',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk', '-fembed-bitcode'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS.sdk', '-fembed-bitcode']
+  },
+  tvos_simulator_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-tvos12.0-simulator',
+      cpp: 'clang++ -target arm64-apple-tvos12.0-simulator',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'tvos',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVSimulator.platform/Developer/SDKs/AppleTVSimulator.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVSimulator.platform/Developer/SDKs/AppleTVSimulator.sdk']
+  },
+  tvos_simulator_x86_64: {
+    binaries: {
+      c: 'clang -target x86_64-apple-tvos12.0-simulator',
+      cpp: 'clang++ -target x86_64-apple-tvos12.0-simulator',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'tvos',
+      cpu_family: 'x86_64',
+      cpu: 'x86_64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVSimulator.platform/Developer/SDKs/AppleTVSimulator.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/AppleTVSimulator.platform/Developer/SDKs/AppleTVSimulator.sdk']
+  },
+  watchos_arm64: {
+    binaries: {
+      c: 'clang -target arm64_32-apple-watchos5.0',
+      cpp: 'clang++ -target arm64_32-apple-watchos5.0',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'watchos',
+      cpu_family: 'aarch64',
+      cpu: 'arm64_32',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS.sdk', '-fembed-bitcode'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS.sdk', '-fembed-bitcode']
+  },
+  watchos_simulator_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-watchos5.0-simulator',
+      cpp: 'clang++ -target arm64-apple-watchos5.0-simulator',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'watchos',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/WatchSimulator.platform/Developer/SDKs/WatchSimulator.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/WatchSimulator.platform/Developer/SDKs/WatchSimulator.sdk']
+  },
+  watchos_simulator_x86_64: {
+    binaries: {
+      c: 'clang -target x86_64-apple-watchos5.0-simulator',
+      cpp: 'clang++ -target x86_64-apple-watchos5.0-simulator',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'watchos',
+      cpu_family: 'x86_64',
+      cpu: 'x86_64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/WatchSimulator.platform/Developer/SDKs/WatchSimulator.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/WatchSimulator.platform/Developer/SDKs/WatchSimulator.sdk']
+  },
+  visionos_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-xros1.0',
+      cpp: 'clang++ -target arm64-apple-xros1.0',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'visionos',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/XROS.platform/Developer/SDKs/XROS.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/XROS.platform/Developer/SDKs/XROS.sdk']
+  },
+  visionos_simulator_arm64: {
+    binaries: {
+      c: 'clang -target arm64-apple-xros1.0-simulator',
+      cpp: 'clang++ -target arm64-apple-xros1.0-simulator',
+      ar: 'ar',
+      strip: 'strip'
+    },
+    host_machine: {
+      system: 'visionos',
+      cpu_family: 'aarch64',
+      cpu: 'aarch64',
+      endian: 'little'
+    },
+    c_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/XRSimulator.platform/Developer/SDKs/XRSimulator.sdk'],
+    c_link_args: ['-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/XRSimulator.platform/Developer/SDKs/XRSimulator.sdk']
+  },
   emscripten: {
     binaries: {
       c: 'emcc',
       cpp: 'em++',
       ar: 'emar',
-      strip: 'emstrip',
-      ranlib: 'emranlib'
+      strip: 'emstrip'
     },
     host_machine: {
       system: 'emscripten',
@@ -108,31 +314,19 @@ Build.toolchains = {
       cpu: 'wasm32',
       endian: 'little'
     },
-    c_args: ['-sUSE_PTHREADS=0'],
-    c_link_args: ['-sALLOW_MEMORY_GROWTH=1', '-sEXPORTED_RUNTIME_METHODS=ccall,cwrap']
+    c_args: [],
+    c_link_args: []
   }
 }
 
-// Target aliases for convenience
-Build.target_aliases = {
-  'win': 'windows',
-  'win64': 'windows',
-  'mingw': 'windows',
-  'pd': 'playdate'
-}
-
-// Resolve target name (handle aliases)
-Build.resolve_target = function(target) {
-  if (!target) return null
-  target = target.toLowerCase()
-  return Build.target_aliases[target] || target
+Build.has_target = function(target) {
+  return Build.toolchains[target] != null
 }
 
 // Get toolchain for a target (null = host)
 Build.get_toolchain = function(target) {
   if (!target) return null
-  target = Build.resolve_target(target)
-  return Build.toolchains[target] || null
+  return Build.toolchains[target]
 }
 
 // Get compiler command for target
diff --git a/scripts/engine.cm b/scripts/engine.cm
index 7d096ef1..3bcd51fa 100644
--- a/scripts/engine.cm
+++ b/scripts/engine.cm
@@ -597,7 +597,6 @@ function turn(msg)
 }
 
 //log.console(`FIXME: need to get main from config, not just set to true`)
-//log.console(`FIXME: actors need the truncated use function as well`)
 //log.console(`FIXME: remove global access (ie globalThis.use)`)
 //log.console(`FIXME: add freeze/unfreeze at this level, so we can do it (but scripts cannot)`)
 actor_mod.register_actor(cell.id, turn, true, config.system.ar_timer)
diff --git a/scripts/shop.cm b/scripts/shop.cm
index a4482285..e6055f2f 100644
--- a/scripts/shop.cm
+++ b/scripts/shop.cm
@@ -540,6 +540,19 @@ var open_dls = {}
 // for script forms, path is the canonical path of the module
 var script_forms = []
 
+// Construct a descriptive compile name with extension preserved.
+// Formats:
+//   core:<module path>
+//   <package>:<module path>   (package is the full canonical package name)
+//   local:<module path>
+//   package:<module path>     (fallback when pkg isn't provided but path is under .cell/modules)
+function make_compile_name(path, rel_path, pkg, scope) {
+  if (scope == SCOPE_CORE) return 'core:' + rel_path
+  if (pkg) return pkg + ':' + rel_path
+  if (path && path.startsWith('.cell/modules/')) return 'package:' + rel_path
+  return 'local:' + rel_path
+}
+
 script_forms['.cm'] = function(path, script, pkg) {
   var pkg_arg = pkg ? `'${pkg}'` : 'null'
   var relative_use_fn = `def use = function(path) { return globalThis.use(path, ${pkg_arg});}`
@@ -599,9 +612,11 @@ function resolve_mod_fn(path, pkg)
   var ext = path.substring(path.lastIndexOf('.'))
   var script_form = script_forms[ext]
   if (!script_form) throw new Error(`No script form for extension ${ext}`)
-  
+
+  var compile_name = make_compile_name(path, rel_path, pkg, pkg ? SCOPE_PACKAGE : SCOPE_LOCAL)
+
   var script = script_form(path, text(fd.slurp(path)), pkg)
-  var fn = js.compile(path, script)
+  var fn = js.compile(compile_name, script)
   ensure_dir(cache_path.substring(0, cache_path.lastIndexOf('/')))
   fd.slurpwrite(cache_path, js.compile_blob(fn))
   return js.eval_compile(fn)
@@ -636,14 +651,15 @@ function resolve_locator(path, ext, ctx)
   // Check embedded pack (core_qop)
   // For packages, try the full package path first
   if (ctx) {
-    var pkg_qop_path = ctx + '/' + path + ext
-    var pkg_core = core_qop.read(pkg_qop_path)
+    var pkg_rel = ctx + '/' + path + ext
+    var pkg_core = core_qop.read(pkg_rel)
     if (pkg_core != null) {
       var form = script_forms[ext]
       if (!form) throw new Error(`No script form for extension ${ext}`)
       var script = form(null, text(pkg_core), ctx)
-      var fn = js.compile(pkg_qop_path, script)
-      return {path: pkg_qop_path, scope: SCOPE_CORE, symbol:js.eval_compile(fn)};
+      var compile_name = make_compile_name(pkg_rel, pkg_rel, ctx, SCOPE_CORE)
+      var fn = js.compile(compile_name, script)
+      return {path: pkg_rel, scope: SCOPE_CORE, symbol:js.eval_compile(fn)};
     }
   }
   
@@ -652,8 +668,9 @@ function resolve_locator(path, ext, ctx)
     var form = script_forms[ext]
     if (!form) throw new Error(`No script form for extension ${ext}`)
     var script = form(null,text(core))
-    var fn = js.compile(path, script)
-    return {path, scope: SCOPE_CORE, symbol:js.eval_compile(fn)};
+    var compile_name = make_compile_name(path + ext, path + ext, null, SCOPE_CORE)
+    var fn = js.compile(compile_name, script)
+    return {path: path + ext, scope: SCOPE_CORE, symbol:js.eval_compile(fn)};
   }
 
   return null;
diff --git a/scripts/test.ce b/scripts/test.ce
index 505fa760..ce42a42f 100644
--- a/scripts/test.ce
+++ b/scripts/test.ce
@@ -97,14 +97,15 @@ function spawn_actor_test(test_info) {
         // Spawn the actor test - it should send back results
         // The actor receives $_.parent which it can use to send results
         var actor_path = test_info.path.substring(0, test_info.path.length - 3) // remove .ce
-        entry.actor = $_.spawn(actor_path)
+        entry.actor = $_.start(actor_path)
         pending_actor_tests.push(entry)
     } catch (e) {
         entry.status = "failed"
         entry.error = { message: `Failed to spawn actor: ${e}` }
         entry.duration_ns = 0
         actor_test_results.push(entry)
-        log.console(`    FAIL ${test_name}: ${e}`)
+        log.console(`    FAIL ${test_name}: `)
+        log.error(e)
     }
 }
 
@@ -270,7 +271,8 @@ if (all_actor_tests.length > 0) {
 }
 
 // Handle messages from actor tests
-// Actor tests should send: { type: "test_result", passed: bool, error: string|null }
+// Actor tests should send either a single result `{ type: "test_result", ... }`
+// or an array / object containing multiple results (e.g. {results:[...]})
 function handle_actor_message(msg) {
     // Find the pending test from this sender
     var sender = msg.$sender
@@ -284,29 +286,47 @@ function handle_actor_message(msg) {
     
     if (found_idx == -1) return // Unknown sender
     
-    var entry = pending_actor_tests[found_idx]
+    var base_entry = pending_actor_tests[found_idx]
     pending_actor_tests.splice(found_idx, 1)
     
     var end_time = time.number()
-    entry.duration_ns = Math.round((end_time - entry.start_time) * 1000000000)
+    var duration_ns = Math.round((end_time - base_entry.start_time) * 1000000000)
     
-    if (msg.type == "test_result") {
-        if (msg.passed) {
+    // Normalize to an array of result objects
+    var results = []
+    if (Array.isArray(msg)) {
+        results = msg
+    } else if (msg && Array.isArray(msg.results)) {
+        results = msg.results
+    } else {
+        results = [msg]
+    }
+    
+    for (var i = 0; i < results.length; i++) {
+        var res = results[i] || {}
+        var entry = {
+            package: base_entry.package,
+            file: base_entry.file,
+            test: res.test || base_entry.test + (results.length > 1 ? `#${i+1}` : ""),
+            status: "failed",
+            duration_ns: duration_ns
+        }
+        
+        if (res.type && res.type != "test_result") {
+            entry.error = { message: `Unexpected message type: ${res.type}` }
+            log.console(`    FAIL ${entry.test}: unexpected message`)
+        } else if (res.passed) {
             entry.status = "passed"
             log.console(`    PASS  ${entry.test}`)
         } else {
-            entry.status = "failed"
-            entry.error = { message: msg.error || "Test failed" }
-            if (msg.stack) entry.error.stack = msg.stack
+            entry.error = { message: res.error || "Test failed" }
+            if (res.stack) entry.error.stack = res.stack
             log.console(`    FAIL ${entry.test}: ${entry.error.message}`)
         }
-    } else {
-        entry.status = "failed"
-        entry.error = { message: `Unexpected message type: ${msg.type}` }
-        log.console(`    FAIL ${entry.test}: unexpected message`)
+        
+        actor_test_results.push(entry)
     }
     
-    actor_test_results.push(entry)
     check_completion()
 }
 
diff --git a/tests/delay_actor.ce b/tests/delay.ce
similarity index 88%
rename from tests/delay_actor.ce
rename to tests/delay.ce
index 67d6bc5f..c9784ef1 100644
--- a/tests/delay_actor.ce
+++ b/tests/delay.ce
@@ -1,4 +1,3 @@
-log.console('hello')
 var count = 0
 function loop()
 {
diff --git a/tests/delay.cm b/tests/delay.cm
deleted file mode 100644
index 9026e7bc..00000000
--- a/tests/delay.cm
+++ /dev/null
@@ -1,6 +0,0 @@
-return {
-    test_delay: function() {
-        // Spawns the delay actor which counts to 60 and stops
-        $_.start(e => {}, "tests/delay_actor")
-    }
-}
diff --git a/tests/kill.ce b/tests/kill.ce
new file mode 100644
index 00000000..9f805cfa
--- /dev/null
+++ b/tests/kill.ce
@@ -0,0 +1,14 @@
+$_.start(e => {
+  log.console(`got message from hanger: ${e.type}`)
+  if (e.type == 'greet')
+    $_.delay(_ => {
+      log.console(`sending stop message to hanger`)
+      $_.stop(e.actor)
+    }, 1)
+    
+  if (e.type == 'disrupt') {
+    log.console(`underling successfully killed.`)
+    send($_.parent, { type: "test_result", passed: true })
+    $_.stop()
+  }
+}, 'tests/hang_actor')
diff --git a/tests/kill.cm b/tests/kill.cm
deleted file mode 100644
index 28af00f9..00000000
--- a/tests/kill.cm
+++ /dev/null
@@ -1,17 +0,0 @@
-return {
-    test_kill: function() {
-        $_.start(e => {
-          log.console(`got message from hanger: ${e.type}`)
-          if (e.type == 'greet')
-            $_.delay(_ => {
-              log.console(`sending stop message to hanger`)
-              $_.stop(e.actor)
-            }, 1)
-            
-          if (e.type == 'disrupt') {
-            log.console(`underling successfully killed.`)
-            // $_.stop() // Removed for module test
-          }
-        }, 'tests/hang_actor')
-    }
-}
diff --git a/tests/reply.cm b/tests/reply.cm
index 52eb2705..0d2632be 100644
--- a/tests/reply.cm
+++ b/tests/reply.cm
@@ -1,5 +1 @@
-return {
-    test_reply: function() {
-        $_.start(e => {}, "tests/reply_actor")
-    }
-}
+$_.start(e => {}, "tests/reply_actor")