message: Refine an error message when MLIR converter encounters mutable variable cases
diff: @@ -70,9 +70,10 @@ void FreezeGlobalTensorsPass::runOnOperation() {
  // previous optimize global tensors pass). If not, this pass has to fail
  // since it cannot perform one of its goals.
  if (global_tensor.is_mutable()) {
  - global_tensor.emitError() << "is not immutable, try running "
  - "tf-saved-model-optimize-global-tensors "
  - "to prove tensors are immutable";
  + global_tensor.emitError()
  + << "is not immutable, try removing mutable variables in your model "
  + "since mutable variables are currently not supported through "
  + "this converter";
  return signalPassFailure();
  }
  