human
Solve the following python programming problem given the following code:
def _starts_block(token, state) : 
    def callback(lexer, match, ctx) : 
        (yield (match.start (), token, match.group (0))) 
        if hasattr (ctx, 'last_indentation') : 
            ctx.block_indentation = ctx.last_indentation 
else : 
            ctx.block_indentation = '' 
ctx.block_state = state 
        ctx.pos = match.end () 
return token 

    
    

    Fix the buggy line: return token
assistant
#Here is Python code to fix the buggy line: return token
.

return def callback(