public void visitAssignmentExpression(GrAssignmentExpression expression) {
    GrExpression lValue = expression.getLValue();
    if (expression.getOperationTokenType() != mASSIGN) {
      if (lValue instanceof GrReferenceExpression
          && myPolicy.isReferenceAccepted((GrReferenceExpression) lValue)) {
        String referenceName = ((GrReferenceExpression) lValue).getReferenceName();
        if (referenceName != null) {
          addNodeAndCheckPending(new ReadWriteVariableInstruction(referenceName, lValue, READ));
        }
      }
    }

    GrExpression rValue = expression.getRValue();
    if (rValue != null) {
      rValue.accept(this);
      lValue.accept(this);
    }
  }