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A problem in program

From: 赵阳
Subject: A problem in program
Date: Mon, 23 Oct 2006 20:19:42 +0800 (CST)

Hi, all:
Now I encounter a problem in programming. Consider the follow program.

q :-.......
write('propagate success!'),nl,
L = [first|_],
write('first = '),write(first),nl,

the first call solve_propagate() has bound the L, Line1, Line2(they are all list). I want get the fisrt element of L (variable first) and use to in the next call stato_img(). But it does not work. The program stops at L = [first|_] and gives a warning "user directive failed".
I want to know what the problem is and how to solve it. Thank you!

Zhao, Yang

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