Fix 'Unused local variable' hints in analyzer and analysis_server.

pkg/analyzer/test/generated/ast_test.dart

Index: pkg/analyzer/test/generated/ast_test.dart
diff --git a/pkg/analyzer/test/generated/ast_test.dart b/pkg/analyzer/test/generated/ast_test.dart
index 58ea86fe1a4652037741709bebe8dbd1d147d068..f1ccfbf3d8d8a40cd9b4868659760fe8cb95d88b 100644
--- a/pkg/analyzer/test/generated/ast_test.dart
+++ b/pkg/analyzer/test/generated/ast_test.dart
@@ -957,8 +957,7 @@ class SimpleIdentifierTest extends ParserTestCase {
     SimpleIdentifier identifier = AstFactory.identifier3("a");
     Expression iterator = AstFactory.listLiteral([]);
     Statement body = AstFactory.block([]);
-    ForEachStatement forEachStatement =
-        AstFactory.forEachStatement2(identifier, iterator, body);
+    AstFactory.forEachStatement2(identifier, iterator, body);
     expect(identifier.inGetterContext(), isFalse);
   }
 
@@ -990,8 +989,7 @@ class SimpleIdentifierTest extends ParserTestCase {
     SimpleIdentifier identifier = AstFactory.identifier3("a");
     Expression iterator = AstFactory.listLiteral([]);
     Statement body = AstFactory.block([]);
-    ForEachStatement forEachStatement =
-        AstFactory.forEachStatement2(identifier, iterator, body);
+    AstFactory.forEachStatement2(identifier, iterator, body);
     expect(identifier.inSetterContext(), isTrue);
   }
 
@@ -1207,7 +1205,7 @@ class SimpleStringLiteralTest extends ParserTestCase {
 
 class StringInterpolationTest extends ParserTestCase {
   void test_contentsOffsetEnd() {
-    var be = AstFactory.interpolationExpression(AstFactory.identifier3('bb'));
+    AstFactory.interpolationExpression(AstFactory.identifier3('bb'));
     // 'a${bb}ccc'
     {
       var ae = AstFactory.interpolationString("'a", "a");