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

Index: pkg/compiler/lib/src/resolution/members.dart
diff --git a/pkg/compiler/lib/src/resolution/members.dart b/pkg/compiler/lib/src/resolution/members.dart
index e5f3477e38d8f85eb02396c7d4cb2c4836a827e9..9fb5495a263d791b6bbe0190fd8af48b046d14ed 100644
--- a/pkg/compiler/lib/src/resolution/members.dart
+++ b/pkg/compiler/lib/src/resolution/members.dart
@@ -4602,6 +4602,15 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
         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, () {
@@ -4623,7 +4632,6 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
     });
     // TODO(15575): We should warn if we can detect a fall through
     // error.
-    registry.registerFeature(Feature.FALL_THROUGH_ERROR);
     return const NoneResult();
   }