Handle local functions in kernel_impact.

pkg/compiler/lib/src/ssa/kernel_impact.dart

Index: pkg/compiler/lib/src/ssa/kernel_impact.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_impact.dart b/pkg/compiler/lib/src/ssa/kernel_impact.dart
index 15efe23e8b2da8e019c868e3dae9b1b49672008c..f03bd1f61372d7b4ae273ad2d6e43e6eb6ff3e92 100644
--- a/pkg/compiler/lib/src/ssa/kernel_impact.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_impact.dart
@@ -5,6 +5,7 @@
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
+import '../common/names.dart';
 import '../compiler.dart';
 import '../constants/expressions.dart';
 import '../dart_types.dart';
@@ -243,10 +244,17 @@ class KernelImpactBuilder extends ir.Visitor {
 
   @override
   void visitMethodInvocation(ir.MethodInvocation invocation) {
-    invocation.receiver.accept(this);
+    var receiver = invocation.receiver;
+    if (receiver is ir.VariableGet &&
+        receiver.variable.isFinal &&
+        receiver.variable.parent is ir.FunctionDeclaration) {
+      // Invocation of a local function. No need for dynamic use.
+    } else {
+      invocation.receiver.accept(this);
+      impactBuilder.registerDynamicUse(
+          new DynamicUse(astAdapter.getSelector(invocation), null));
+    }
     _visitArguments(invocation.arguments);
-    impactBuilder.registerDynamicUse(
-        new DynamicUse(astAdapter.getSelector(invocation), null));
   }
 
   @override
@@ -265,11 +273,6 @@ class KernelImpactBuilder extends ir.Visitor {
   }
 
   @override
-  void visitNot(ir.Not not) {
-    not.operand.accept(this);
-  }
-
-  @override
   void visitAssertStatement(ir.AssertStatement node) {
     impactBuilder.registerFeature(
         node.message != null ? Feature.ASSERT_WITH_MESSAGE : Feature.ASSERT);
@@ -277,5 +280,19 @@ class KernelImpactBuilder extends ir.Visitor {
   }
 
   @override
+  void visitStringConcatenation(ir.StringConcatenation node) {
+    impactBuilder.registerFeature(Feature.STRING_INTERPOLATION);
+    impactBuilder.registerFeature(Feature.STRING_JUXTAPOSITION);
+    node.visitChildren(this);
+  }
+
+  @override
+  void visitFunctionDeclaration(ir.FunctionDeclaration node) {
+    impactBuilder
+        .registerStaticUse(new StaticUse.closure(astAdapter.getElement(node)));
+    node.visitChildren(this);
+  }
+
+  @override
   void defaultNode(ir.Node node) => node.visitChildren(this);
 }