code: def scan_over_(self, valid):
      p = self.pos_
      while p < self.text_length_ and self.text_[p] in valid:
          p += 1
      self.pos_ = p
  
imports: from fontTools.feaLib.error import FeatureLibError, IncludedFeaNotFound
  from fontTools.feaLib.location import FeatureLibLocation
  import re
  import os
label_desc: Use image node_id 7 for calling the Lexer obj's underlying member method code with example usage: obj.scan_over_(valid) without return types