class_docstr: Set the default interpreted text role.  Overridden from docutils.
class_docstr_tok: ["Set","the","default","interpreted","text","role",".","Overridden","from","docutils","."]
code: def run(self) -> list[Node]:
      if not self.arguments:
          docutils.unregister_role("")
          return []
      role_name = self.arguments[0]
      role, messages = roles.role(
          role_name,
          self.state_machine.language,
          self.lineno,
          self.state.reporter,
      )
      if role:  # type: ignore[truthy-function]
          docutils.register_role("", role)  # type: ignore[arg-type]
          self.env.temp_data["default_role"] = role_name
      else:
          literal_block = nodes.literal_block(
              self.block_text, self.block_text
          )
          reporter = self.state.reporter
          error = reporter.error(
              'Unknown interpreted text role "%s".' % role_name,
              literal_block,
              line=self.lineno,
          )
          messages += [error]
  
      return cast(list[nodes.Node], messages)
  
imports: from __future__ import annotations
  import re
  from typing import TYPE_CHECKING, Any, Generic, TypeVar, cast
  from docutils import nodes
  from docutils.parsers.rst import directives, roles
  from sphinx import addnodes
  from sphinx.addnodes import desc_signature
  from sphinx.util import docutils
  from sphinx.util.docfields import DocFieldTransformer, Field, TypedField
  from sphinx.util.docutils import SphinxDirective
  from sphinx.util.nodes import nested_parse_with_titles
  from sphinx.util.typing import OptionSpec
label_desc: Use image node_id 1 for calling the DefaultRole obj's underlying member method code with example usage: obj.run() and returns: cast, list