code: def _check_resources(name, expr, resources):
      
      if expr is None:
          return
      bound = expr._resources()
      if not bound and resources is None:
          raise ValueError('no resources provided to compute %s' % name)
      if bound and resources:
          raise ValueError(
              'explicit and implicit resources provided to compute %s' % name,
          )
docs: Validate that the expression and resources passed match up.
  
      Parameters
      ----------
      name : str
          The name of the argument we are checking.
      expr : Expr
          The potentially bound expr.
      resources
          The explicitly passed resources to compute expr.
  
      Raises
      ------
      ValueError
          If the resources do not match for an expression.