Add YieldStatement support to ExitDetector

pkg/analyzer/test/generated/all_the_rest_test.dart

 // Copyright (c) 2014, 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 analyzer.test.generated.all_the_rest_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 3944 matching lines @@
     return;
     if (1 < 2) {
       break x;
     }
   }
 }
 ''');
     _assertNthStatementExits(source, 0);
   }
 
+  void test_yieldStatement_plain() {
+    Source source = addSource(r'''
+void f() sync* {
+  yield 1;
+}
+''');
+    _assertNthStatementDoesNotExit(source, 0);
+  }
+
+  void test_yieldStatement_throw() {
+    Source source = addSource(r'''
+void f() sync* {
+  yield throw '';
+}
+''');
+    _assertNthStatementExits(source, 0);
+  }
+
+  void test_yieldStatement_star_plain() {
+    Source source = addSource(r'''
+void f() sync* {
+  yield* 1;
+}
+''');
+    _assertNthStatementDoesNotExit(source, 0);
+  }
+
+  void test_yieldStatement_star_throw() {
+    Source source = addSource(r'''
+void f() sync* {
+  yield* throw '';
+}
+''');
+    _assertNthStatementExits(source, 0);
+  }
+
   void _assertHasReturn(bool expectedResult, Source source, int n) {
     LibraryElement element = resolve2(source);
     CompilationUnit unit = resolveCompilationUnit(source, element);
     FunctionDeclaration function = unit.declarations.last;
     BlockFunctionBody body = function.functionExpression.body;
     Statement statement = body.block.statements[n];
     expect(ExitDetector.exits(statement), expectedResult);
   }
 
   // Assert that the [n]th statement in the last function declaration of
@@ skipping 380 matching lines @@
     expect(UriKind.fromEncoding(0x70), same(UriKind.PACKAGE_URI));
     expect(UriKind.fromEncoding(0x58), same(null));
   }
 
   void test_getEncoding() {
     expect(UriKind.DART_URI.encoding, 0x64);
     expect(UriKind.FILE_URI.encoding, 0x66);
     expect(UriKind.PACKAGE_URI.encoding, 0x70);
   }
 }