code: def _read_unsupported(fname, **kwargs):
      ext = "".join(Path(fname).suffixes)
      msg = f"Unsupported file type ({ext})."
      suggest = kwargs.get("suggest")
      if suggest is not None:
          msg += f" Try reading a {suggest} file instead."
      msg += " Consider using a dedicated reader function for more options."
      raise ValueError(msg)
  
file_path: mne-python/mne/io/_read_raw.py
imports: from functools import partial
  from pathlib import Path
  from ..utils import fill_doc
  from .base import BaseRaw
label_desc: Use image node_id 1 for calling a global function with example usage: _read_unsupported(fname) without return types