Fix corner cases of type inference with implicit references to `.call`.

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

 // Copyright (c) 2016, 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.
 
 library fasta.body_builder;
 
 import '../fasta_codes.dart'
     show FastaMessage, codeExpectedButGot, codeExpectedFunctionBody;
 
 import '../parser/parser.dart' show FormalParameterType, MemberKind, optional;
@@ skipping 627 matching lines @@
       push(finishSend(receiver, arguments, beginToken.charOffset));
     }
   }
 
   @override
   finishSend(Object receiver, Arguments arguments, int charOffset) {
     if (receiver is FastaAccessor) {
       return receiver.doInvocation(charOffset, arguments);
     } else {
       return buildMethodInvocation(
-          toValue(receiver), callName, arguments, charOffset);
+          toValue(receiver), callName, arguments, charOffset,
+          isImplicitCall: true);
     }
   }
 
   @override
   void beginCascade(Token token) {
     debugEvent("beginCascade");
     Expression expression = popForValue();
     if (expression is KernelCascadeExpression) {
       push(expression);
       push(new VariableAccessor(this, token, expression.variable));
@@ skipping 129 matching lines @@
       return throwNoSuchMethodError(
           node.name.name, node.arguments, node.fileOffset,
           isSuper: true);
     }
     Expression receiver = new KernelDirectPropertyGet(
         new ThisExpression()..fileOffset = node.fileOffset, target);
     // TODO(ahe): Use [DirectPropertyGet] when possible, that is, remove the
     // next line:
     receiver = new KernelSuperPropertyGet(node.name, target);
     return buildMethodInvocation(
-        receiver, callName, node.arguments, node.fileOffset);
+        receiver, callName, node.arguments, node.fileOffset,
+        isImplicitCall: true);
   }
 
   bool areArgumentsCompatible(FunctionNode function, Arguments arguments) {
     // TODO(ahe): Implement this.
     return true;
   }
 
   @override
   Expression throwNoSuchMethodError(
       String name, Arguments arguments, int charOffset,
@@ skipping 2031 matching lines @@
     }
     return expression;
   }
 
   @override
   bool isIdentical(Member member) => member == coreTypes.identicalProcedure;
 
   @override
   Expression buildMethodInvocation(
       Expression receiver, Name name, Arguments arguments, int offset,
-      {bool isConstantExpression: false, bool isNullAware: false}) {
+      {bool isConstantExpression: false,
+      bool isNullAware: false,
+      bool isImplicitCall: false}) {
     if (constantExpressionRequired && !isConstantExpression) {
       return buildCompileTimeError("Not a constant expression.", offset);
     }
     if (isNullAware) {
       VariableDeclaration variable = new VariableDeclaration.forValue(receiver);
       return makeLet(
           variable,
           new ConditionalExpression(
               buildIsNull(new VariableGet(variable)),
               new NullLiteral(),
               new MethodInvocation(new VariableGet(variable), name, arguments)
                 ..fileOffset = offset,
               const DynamicType()));
     } else {
-      return new KernelMethodInvocation(receiver, name, arguments)
+      return new KernelMethodInvocation(receiver, name, arguments,
+          isImplicitCall: isImplicitCall)
         ..fileOffset = offset;
     }
   }
 
   @override
   void addCompileTimeErrorFromMessage(FastaMessage message) {
     library.addCompileTimeError(message.charOffset, message.message,
         fileUri: message.uri);
   }
 
@@ skipping 449 matching lines @@
     if (starToken == null) {
       return AsyncMarker.Async;
     } else {
       assert(identical(starToken.stringValue, "*"));
       return AsyncMarker.AsyncStar;
     }
   } else {
     return internalError("Unknown async modifier: $asyncToken");
   }
 }