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

pkg/analyzer/test/src/task/strong/front_end_inference_test.dart

Index: pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
diff --git a/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart b/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
index 216d1712d9d8d9c6e39238dde1a767cea86f6e4e..9a078bc3ce8f1e8d055307e2c8cd6b3645783017 100644
--- a/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
+++ b/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
@@ -361,6 +361,15 @@ class _InstrumentationVisitor extends RecursiveAstVisitor<Null> {
   @override
   visitFunctionExpressionInvocation(FunctionExpressionInvocation node) {
     super.visitFunctionExpressionInvocation(node);
+    var receiverType = node.function.staticType;
+    if (receiverType is InterfaceType) {
+      // This is a hack since analyzer doesn't record .call targets
+      var target = receiverType.element.lookUpMethod('call', null) ??
+          receiverType.element.lookUpGetter('call', null);
+      if (target != null) {
+        _recordTarget(node.argumentList.offset, target);
+      }
+    }
     if (node.typeArguments == null) {
       var inferredTypeArguments = _getInferredFunctionTypeArguments(
               node.function.staticType,