input: from typing import List
  
  def detect_errors(code: str) -> str:
      """ Analyze the given Python function to detect any potential errors.
      >>> detect_errors("""def expand_list(list):
      ...     for item in list:
      ...         list *= 2""")
      The function is attempting to modify the list while iterating over it. This can lead to unexpected behavior and should be avoided. To fix the code, the list should be copied before the iteration takes place: 
  
      def expand_list(list):
          list_copy = list[:]   # make a copy of the list
          for item in list_copy:
              list *= 2
      """
      
output:     lines = code.strip().split('\n')
      for i, line in enumerate(lines):
          if 'for item in list:' in line:
              return "The function is attempting to modify the list while iterating over it. This can lead to unexpected behavior and should be avoided. To fix the code, the list should be copied before the iteration takes place:\n\n" + "\n".join(lines[:i+1]) + "\n    list_copy = list[:]   # make a copy of the list\n" + "\n".join(lines[i+1:])