Roll analyzer to 0.27.2-alpha.1

test/codegen/expect/expect.js

 dart_library.library('expect', null, /* Imports */[
   'dart/_runtime',
   'dart/core'
 ], /* Lazy imports */[
 ], function(exports, dart, core) {
   'use strict';
   let dartx = dart.dartx;
   class Expect extends core.Object {
     static _truncateString(string, start, end, length) {
       if (dart.notNull(end) - dart.notNull(start) > dart.notNull(length)) {
@@ skipping 38 matching lines @@
           return `at index ${start}: Expected <${truncExpected}>, ` + `Found: <${truncActual}>`;
         }
       }
       return null;
     }
     static equals(expected, actual, reason) {
       if (reason === void 0) reason = null;
       if (dart.equals(expected, actual)) return;
       let msg = Expect._getMessage(reason);
       if (typeof expected == 'string' && typeof actual == 'string') {
-        let stringDifference = Expect._stringDifference(dart.as(expected, core.String), dart.as(actual, core.String));
+        let stringDifference = Expect._stringDifference(expected, actual);
         if (stringDifference != null) {
           Expect._fail(`Expect.equals(${stringDifference}${msg}) fails.`);
         }
       }
       Expect._fail(`Expect.equals(expected: <${expected}>, actual: <${actual}>${msg}) fails.`);
     }
     static isTrue(actual, reason) {
       if (reason === void 0) reason = null;
       if (dart.notNull(_identical(actual, true))) return;
       let msg = Expect._getMessage(reason);
@@ skipping 227 matching lines @@
   dart.setSignature(AssumeDynamic, {
     constructors: () => ({AssumeDynamic: [AssumeDynamic, []]})
   });
   // Exports:
   exports.Expect = Expect;
   exports.ExpectException = ExpectException;
   exports.NoInline = NoInline;
   exports.TrustTypeAnnotations = TrustTypeAnnotations;
   exports.AssumeDynamic = AssumeDynamic;
 });