Accept more labels per switch case.

lib/compiler/implementation/resolver.dart

Index: lib/compiler/implementation/resolver.dart
diff --git a/lib/compiler/implementation/resolver.dart b/lib/compiler/implementation/resolver.dart
index 338148d6de278863f03f569c4f2868a603ce58f1..82234e68d905e67a1e928bb5d4d4970a4baa668a 100644
--- a/lib/compiler/implementation/resolver.dart
+++ b/lib/compiler/implementation/resolver.dart
@@ -1213,6 +1213,10 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
       if (!target.statement.isValidContinueTarget()) {
         error(node.target, MessageKind.INVALID_CONTINUE, [labelName]);
       }
+      // TODO(lrn): Handle continues to switch cases.
+      if (target.statement is SwitchCase) {
+        unimplemented(node, "continue to switch case");
+      }
       label.setContinueTarget();
       mapping[node.target] = label;
     }
@@ -1237,6 +1241,10 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
     }
   }
 
+  visitLabel(Label node) {
+    // Labels are handled by their containing statements/cases.
+  }
+
   visitLabeledStatement(LabeledStatement node) {
     String labelName = node.label.slowToString();
     LabelElement existingElement = statementScope.lookupLabel(labelName);
@@ -1283,8 +1291,9 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
     Link<Node> cases = node.cases.nodes;
     while (!cases.isEmpty()) {
       SwitchCase switchCase = cases.head;
-      if (switchCase.label !== null) {
-        Label label = switchCase.label;
+      for (Node labelOrCase in switchCase.labelsAndCases) {
+        if (labelOrCase is! Label) continue;
+        Label label = labelOrCase;
         String labelName = label.slowToString();
 
         LabelElement existingElement = continueLabels[labelName];
@@ -1315,19 +1324,21 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
         continueLabels[labelName] = labelElement;
       }
       cases = cases.tail;
+      // Test that only the last case, if any, is a default case.
       if (switchCase.defaultKeyword !== null && !cases.isEmpty()) {
         error(switchCase, MessageKind.INVALID_CASE_DEFAULT);
       }
     }
+
     statementScope.enterSwitch(breakElement, continueLabels);
     node.cases.accept(this);
     statementScope.exitSwitch();
 
-    // Clean-up unused labels
+    // Clean-up unused labels.
     continueLabels.forEach((String key, LabelElement label) {
-      TargetElement targetElement = label.target;
-      SwitchCase switchCase = targetElement.statement;
       if (!label.isContinueTarget) {
+        TargetElement targetElement = label.target;
+        SwitchCase switchCase = targetElement.statement;
         mapping.remove(switchCase);
         mapping.remove(label.label);
       }
@@ -1335,11 +1346,14 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
   }
 
   visitSwitchCase(SwitchCase node) {
-    // The label was handled in [visitSwitchStatement(SwitchStatement)].
-    node.expressions.accept(this);
+    node.labelsAndCases.accept(this);
     visitIn(node.statements, new BlockScope(context));
   }
 
+  visitCaseMatch(CaseMatch node) {
+    visit(node.expression);
+  }
+
   visitTryStatement(TryStatement node) {
     visit(node.tryBlock);
     if (node.catchBlocks.isEmpty() && node.finallyBlock == null) {