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pkg/compiler/lib/src/resolution/members.dart

 // Copyright (c) 2012, 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 dart2js.resolution.members;
 
 import '../common.dart';
 import '../common/names.dart' show Selectors;
 import '../common/resolution.dart' show Resolution;
 import '../compile_time_constants.dart';
@@ skipping 4584 matching lines @@
         LabelDefinition labelElement = targetElement.addLabel(label, labelName);
         registry.defineLabel(label, labelElement);
         continueLabels[labelName] = labelElement;
       }
       cases = cases.tail;
       // Test that only the last case, if any, is a default case.
       if (switchCase.defaultKeyword != null && !cases.isEmpty) {
         reporter.reportErrorMessage(
             switchCase, MessageKind.INVALID_CASE_DEFAULT);
       }
+      if (cases.isNotEmpty) {
+        Node last = switchCase.statements.last;
+        if (last.asBreakStatement() == null &&
+            last.asContinueStatement() == null &&
+            last.asThrow() == null &&
+            last.asReturn() == null) {
+          registry.registerFeature(Feature.FALL_THROUGH_ERROR);
+        }
+      }
     }
 
     addDeferredAction(enclosingElement, () {
       checkCaseExpressions(node);
     });
 
     statementScope.enterSwitch(breakElement, continueLabels);
     node.cases.accept(this);
     statementScope.exitSwitch();
 
     // Clean-up unused labels.
     continueLabels.forEach((String key, LabelDefinition label) {
       if (!label.isContinueTarget) {
         JumpTarget targetElement = label.target;
         SwitchCase switchCase = targetElement.statement;
         registry.undefineTarget(switchCase);
         registry.undefineLabel(label.label);
       }
     });
     // TODO(15575): We should warn if we can detect a fall through
     // error.
-    registry.registerFeature(Feature.FALL_THROUGH_ERROR);
     return const NoneResult();
   }
 
   ResolutionResult visitSwitchCase(SwitchCase node) {
     node.labelsAndCases.accept(this);
     visitIn(node.statements, new BlockScope(scope));
     return const NoneResult();
   }
 
   ResolutionResult visitCaseMatch(CaseMatch node) {
@@ skipping 95 matching lines @@
     }
     return const NoneResult();
   }
 }
 
 /// Looks up [name] in [scope] and unwraps the result.
 Element lookupInScope(
     DiagnosticReporter reporter, Node node, Scope scope, String name) {
   return Elements.unwrap(scope.lookup(name), reporter, node);
 }