Infer types of double literals.

pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart

 // Copyright (c) 2017, 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.
 
 /// This file declares a "shadow hierarchy" of concrete classes which extend
 /// the kernel class hierarchy, adding methods and fields needed by the
 /// BodyBuilder.
 ///
 /// Instances of these classes may be created using the factory methods in
 /// `ast_factory.dart`.
@@ skipping 17 matching lines @@
   KernelBlock(List<Statement> statements) : super(statements);
 
   @override
   void _inferStatement(KernelTypeInferrer inferrer) {
     for (var statement in statements) {
       inferrer.inferStatement(statement);
     }
   }
 }
 
+/// Concrete shadow object representing a double literal in kernel form.
+class KernelDoubleLiteral extends DoubleLiteral implements KernelExpression {
+  KernelDoubleLiteral(double value) : super(value);
+
+  @override
+  DartType _inferExpression(
+      KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
+    return inferrer.inferDoubleLiteral(typeContext, typeNeeded);
+  }
+}
+
 /// Common base class for shadow objects representing expressions in kernel
 /// form.
 abstract class KernelExpression implements Expression {
   /// Calls back to [inferrer] to perform type inference for whatever concrete
   /// type of [KernelExpression] this is.
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded);
 }
 
 /// Concrete shadow object representing an expression statement in kernel form.
@@ skipping 427 matching lines @@
       // KernelVariableDeclaration.
       mutatedInClosure = true;
       declaredType = variable.type;
     }
     return inferrer.inferVariableGet(typeContext, typeNeeded, mutatedInClosure,
         _fact, _scope, fileOffset, declaredType, (type) {
       promotedType = type;
     });
   }
 }