human
Solve the following python programming problem given the following code:
def feature(constant, fallback = None) : 
    def wrap(t) : 
        t.log_feature (constant) 
        t._debug (('Found feature: %s' % constant)) 
        if fallback : 
            t._debug (('Feature has fallback: %s' % repr (fallback))) 
return (lambda * a : (fallback if fallback else { 
            
})) 
return { 
        'value' : constant, 
        'return' : (lambda **kw : kw ['traverser'].log_feature (constant)), 
} 

    
    

    Fix the buggy line: 'value' : constant ,
assistant
#Here is Python program to fix the buggy line: 'value' : constant ,
.

'value' : def wrap(,