Annotation_1_11："Syntactic sugar causes cancer of the semicolon."What does the "cancer of the semicolon" mean ?

[strint]

This disdain for syntax is due partly to the flexibility of Lisp, which makes it easy to change surface syntax, and partly to the observation that many "convenient'' syntactic constructs, which make the language less uniform, end up causing more trouble than they are worth when programs become large and complex. In the words of Alan Perlis, "Syntactic sugar causes cancer of the semicolon.''