human
Solve the following python programming problem given the following code:
def format_value(value, vars) : 
    def _replacer(matchobj) : 
        name = matchobj.group (1) 
        if (name in vars) : 
            return vars [name] 
return matchobj.group (0) 
return _VAR_REPL.sub (value, value) 

    
    

    Fix the buggy line: return _VAR_REPL.sub (value, value)
assistant
#Here is Python program to fix the buggy line: return _VAR_REPL.

return _VAR_REPL.sub (def _replacer(, value)