diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/InconsistentCompilerBehavior.dfy.testdafny.expect b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/InconsistentCompilerBehavior.dfy.testdafny.expect
index 2bd757b626..7e24d9e430 100644
--- a/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/InconsistentCompilerBehavior.dfy.testdafny.expect
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/InconsistentCompilerBehavior.dfy.testdafny.expect
@@ -50,4 +50,5 @@ Diff (changing expected into actual):
 +0
  
 
+(non-blocking) The Rust code generator is internal. Not having a '*.rs.check' file is acceptable for now.
 Executing on ResolvedDesugaredExecutableDafny...
diff --git a/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/TestBeyondVerifierExpect.dfy.testdafny.expect b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/TestBeyondVerifierExpect.dfy.testdafny.expect
index ce5735dda4..a881545e3b 100644
--- a/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/TestBeyondVerifierExpect.dfy.testdafny.expect
+++ b/Source/IntegrationTests/TestFiles/LitTests/LitTest/metatests/TestBeyondVerifierExpect.dfy.testdafny.expect
@@ -50,4 +50,5 @@ Diff (changing expected into actual):
 +hello
  
 
+(non-blocking) The Rust code generator is internal. Not having a '*.rs.check' file is acceptable for now.
 Executing on ResolvedDesugaredExecutableDafny...
diff --git a/Source/TestDafny/MultiBackendTest.cs b/Source/TestDafny/MultiBackendTest.cs
index cbc2996835..6e9d6272ff 100644
--- a/Source/TestDafny/MultiBackendTest.cs
+++ b/Source/TestDafny/MultiBackendTest.cs
@@ -423,6 +423,12 @@ await output.WriteLineAsync(
       }
 
       await output.WriteLineAsync(diffMessage);
+      if (backend.IsInternal) {
+        await output.WriteLineAsync(
+          $"(non-blocking) The {backend.TargetName} code generator is internal. Not having a '*.{backend.TargetId}.check' file is acceptable for now.");
+        return 0;
+      }
+
       return 1;
     }
 
@@ -456,9 +462,25 @@ await output.WriteLineAsync(
         }
       }
 
+      if (backend.IsInternal && checkResult != 0) {
+        await output.WriteLineAsync(
+          $"(non-blocking) The {backend.TargetName} code generator is internal. An unmatched '*.{backend.TargetId}.check' file is acceptable for now.");
+        return 0;
+      }
+
       return checkResult;
     }
 
+
+    if (backend.IsInternal) {
+      await output.WriteLineAsync($"(non-blocking) Execution failed for the internal {backend.TargetName} code generator, for reasons other than known unsupported features. Output:");
+      await output.WriteLineAsync(outputString);
+      await output.WriteLineAsync("Error:");
+      await output.WriteLineAsync(error);
+      await output.WriteLineAsync(
+        $"The {backend.TargetName} code generator is internal. An unmatched '*.{backend.TargetId}.check' file is acceptable for now.");
+      return 0;
+    }
     await output.WriteLineAsync("Execution failed, for reasons other than known unsupported features. Output:");
     await output.WriteLineAsync(outputString);
     await output.WriteLineAsync("Error:");