Check in codegen test expectations.

test/codegen/expect/language/substring_test_none_multi.js

Index: test/codegen/expect/language/substring_test_none_multi.js
diff --git a/test/codegen/expect/language/substring_test_none_multi.js b/test/codegen/expect/language/substring_test_none_multi.js
new file mode 100644
index 0000000000000000000000000000000000000000..e789d5fab58da8467586ebf91b935bc25e6d0c55
--- /dev/null
+++ b/test/codegen/expect/language/substring_test_none_multi.js
@@ -0,0 +1,25 @@
+dart_library.library('language/substring_test_none_multi', null, /* Imports */[
+  'dart_sdk'
+], function load__substring_test_none_multi(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const substring_test_none_multi = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  substring_test_none_multi.main = function() {
+    try {
+    } catch (e$) {
+      if (core.TypeError.is(e$)) {
+        let e = e$;
+      } else if (core.ArgumentError.is(e$)) {
+        let e = e$;
+      } else
+        throw e$;
+    }
+
+  };
+  dart.fn(substring_test_none_multi.main, VoidTodynamic());
+  // Exports:
+  exports.substring_test_none_multi = substring_test_none_multi;
+});