Use explicit throw

Author: RReverser

test/test_other.py

@@ -12779,7 +12779,7 @@ def test_config_closure_compiler(self):
   def test_node_unhandled_rejection(self):
     create_file('pre.js', '''
     async function foo() {
-      var a = missing;
+      abort("this error will become an unhandled rejection");
     }
     async function doReject() {
       return foo();
@@ -12800,7 +12800,7 @@ def test_node_unhandled_rejection(self):
     self.build('main.c', emcc_args=['--pre-js=pre.js', '-sNODEJS_CATCH_REJECTION'])
     output = self.run_js('main.js', assert_returncode=NON_ZERO)
     self.assertContained('unhandledRejection', read_file('main.js'))
-    self.assertContained('ReferenceError: missing is not defined', output)
+    self.assertContained('RuntimeError: Aborted(this error will become an unhandled rejection)', output)
     self.assertContained('at foo (', output)
 
     # Without NODEJS_CATCH_REJECTION we expect node to log the unhandled rejection