class_docstr: This is the central parsing class Jinja uses.  It's passed to
  extensions and can be used to parse expressions or statements.
class_docstr_tok: ["This","is","the","central","parsing","class","Jinja","uses",".","It","'s","passed","to","extensions","and","can","be","used","to","parse","expressions","or","statements","."]
code: def parse_concat(self):
      lineno = self.stream.current.lineno
      args = [self.parse_math2()]
      while self.stream.current.type == "tilde":
          next(self.stream)
          args.append(self.parse_math2())
      if len(args) == 1:
          return args[0]
      return nodes.Concat(args, lineno=lineno)
  
imports: from .None import nodes
  from ._compat import imap
  from .exceptions import TemplateAssertionError
  from .exceptions import TemplateSyntaxError
  from .lexer import describe_token
  from .lexer import describe_token_expr
label_desc: Use image node_id 34 for calling the Parser obj's underlying member method code with example usage: obj.parse_concat() and returns: nodes, args