[cfe] Update expectations

This fell between commits.

Change-Id: Ie76f330f42ea8424704cc44490a573ca7879b40c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/290525
Auto-Submit: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Chloe Stefantsova <cstefantsova@google.com>
diff --git a/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.expect b/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.expect
index e207628..2b54feb 100644
--- a/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.expect
+++ b/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.expect
@@ -42,6 +42,7 @@
           break #L1;
         }
       }
+      throw new _in::ReachabilityError::•("`null` encountered as case in a switch expression with a non-nullable type.");
     }
   } =>#t3;
   #L2:
diff --git a/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.modular.expect b/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.modular.expect
index e207628..2b54feb 100644
--- a/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.modular.expect
@@ -42,6 +42,7 @@
           break #L1;
         }
       }
+      throw new _in::ReachabilityError::•("`null` encountered as case in a switch expression with a non-nullable type.");
     }
   } =>#t3;
   #L2:
diff --git a/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.transformed.expect b/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.transformed.expect
index 7327bf6..2d30d86 100644
--- a/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/patterns/dynamic_guard.dart.weak.transformed.expect
@@ -42,6 +42,7 @@
           break #L1;
         }
       }
+      throw new _in::ReachabilityError::•("`null` encountered as case in a switch expression with a non-nullable type.");
     }
   } =>#t3;
   #L2: