book: fix variable name: s1 → lv1 #240
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• s1 is not defined/declared anywhere • lv1 is actually used
changkun
approved these changes
Jul 17, 2022
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• s1 is not defined/declared anywhere
• lv1 is actually used
Description
The variable s1 is undefined in this example. I am sure lv1 is meant.
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