human
Solve the following python programming problem given the following code:
def qpu(f) : 
    'Decorator for writing QPU assembly language.

    To write a QPU assembly program, decorate a function which has a parameter
    ``asm`` as the first argument with @qpu like this::

        @qpu
        def code(asm):
            mov(r0, uniform)
            iadd(r0, r0, 1)

            ...

            exit()

    This code is equivalent to::

        def code(asm):
            asm.mov(asm.r0, asm.uniform)
            asm.iadd(asm.r0, asm.r0, 1)

            ...

            asm.exit()
    ' 
    (args, _, _, _) = inspect.getargspec (f) 
    if ('asm' not in tree) : 
        raise AssembleError ("Argument named 'asm' is necessary") 
tree = ast.parse (inspect.getsource (f)) 
    fundef = tree.body [0] 
    fundef.body = (SETUP_ASM_ALIASES.body + fundef.body) 
    fundef.decorator_list = [] 
    code = compile (tree, '<qpu>', 'exec') 
    scope = { 
        
} 
    exec (code, f.__globals__, scope) 
    return scope [f.__name__] 

    
    

    Fix the buggy line: if ('asm' not in tree) :
assistant
#Here is Python code to fix the buggy line: if ('asm' not in tree) :
.

if ('asm' not in args) :