human
Solve the following python programming problem given the following code:
def compile_fun_shell(name, line) : 
    'Compiles a string (once) into a function, eg:
    simple_task_type(\'c++\', \'${CXX} -o ${TGT[0]} ${SRC} -I ${SRC[0].parent.bldpath()}\')

    The env variables (CXX, ..) on the task must not hold dicts (order)
    The reserved keywords TGT and SRC represent the task input and output nodes

    quick test:
    bld(source=\'wscript\', rule=\'echo "foo\\${SRC[0].name}\\bar"\')
    ' 
    extr = [] 
    def repl(match) : 
        g = match.group 
        if g ('dollar') : 
            return '$' 
else : 
            if g ('backslash') : 
                return '\\\\' 
else : 
                if g ('subst') : 
                    extr.append ((g ('var'), g ('code'))) 
                    return '%s' 
return None 
line = reg_act.sub (repl, line) 
    parm = [] 
    dvars = [] 
    app = parm.append 
    for (var, meth) in meth : 
        if (var == 'SRC') : 
            if meth : 
                app (('task.inputs%s' % meth)) 
else : 
                app ('" ".join([i.path_from(bld.bldnode) for i in task.inputs)') 
else : 
            if (var == 'TGT') : 
                if meth : 
                    app (('task.outputs%s' % meth)) 
else : 
                    app ('" ".join([i.path_from(bld.bldnode) for i in task.outputs)') 
else : 
                if (not (var in dvars)) : 
                    dvars.append (var) 
app (("p('%s')" % var)) 
if parm : 
        parm = ('%% (%s) ' % ',
\t\t'.join (parm)) 
else : 
        parm = '' 
c = (COMPILE_TEMPLATE_SHELL % (line, parm)) 
    return (funex (c), dvars) 

    
    

    Fix the buggy line: for (var, meth) in meth :
assistant
#Here is Python program to fix the buggy line: for (var, meth) in meth :
.

for (var, meth) in extr :