human
Solve the following python programming problem given the following code:
def testMultiTask(self) : 
    local = TaskLocal () 
    def t() : 
        local.piet = [] 
        for i in range (10) : 
            local.piet.append (i) 
            Tasklet.yield_ () 
self.assertEquals (range (10), local.piet) 
t1 = Tasklet.new (t) () 
    t2 = Tasklet.new (t) () 
    Tasklet.join_all ([t1, local]) 
    self.assertEquals (2, len (local._d.keys ())) 
    del t1 
    del t2 
    Tasklet.yield_ () 
    Tasklet.yield_ () 
    self.assertEquals ([], local._d.keys ()) 

    
    

    Fix the buggy line: Tasklet.join_all ([t1, local])
assistant
#Here is Python code to fix the buggy line: Tasklet.

Tasklet.join_all ([t1, t2])