Require two type arguments for map literals (issue 4522).

lib/compiler/implementation/ssa/codegen.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   final JavaScriptBackend backend;
   SsaCodeGeneratorTask(JavaScriptBackend backend)
       : this.backend = backend,
         super(backend.compiler);
   String get name() => 'SSA code generator';
@@ skipping 1749 matching lines @@
       use(input.inputs[0]);
       push(new js.Binary("!==", pop(), new js.LiteralBool(true)), input);
     } else if (isBuiltinRelational(input) &&
                isGenerateAtUseSite(input) &&
                types[input.inputs[0]].isUseful() &&
                !input.inputs[0].isDouble(types) &&
                types[input.inputs[1]].isUseful() &&
                !input.inputs[1].isDouble(types)) {
       // This optimization doesn't work for NaN, so we only do it if the
       // type is known to be non-Double.
-      Map<String, String> inverseOperator = const <String>{
+      Map<String, String> inverseOperator = const <String, String>{
         "==" : "!=",
         "!=" : "==",
         "===": "!==",
         "!==": "===",
         "<"  : ">=",
         "<=" : ">",
         ">"  : "<=",
         ">=" : "<"
       };
       HRelational relational = input;
@@ skipping 493 matching lines @@
       }
       push(result, node);
     }
     if (node.nullOk) {
       checkNull(input);
       push(new js.Binary('||', pop(), pop()), node);
     }
   }
 
   void visitTypeConversion(HTypeConversion node) {
-    Map<String, SourceString> castNames = const <SourceString> {
+    Map<String, SourceString> castNames = const <String, SourceString> {
       "stringTypeCheck":
           const SourceString("stringTypeCast"),
       "doubleTypeCheck":
           const SourceString("doubleTypeCast"),
       "numTypeCheck":
           const SourceString("numTypeCast"),
       "boolTypeCheck":
           const SourceString("boolTypeCast"),
       "functionTypeCheck":
           const SourceString("functionTypeCast"),
@@ skipping 606 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }