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Pitfalls and subtleties of macros  

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The following documentation discusses some special rules that apply to macros and macro expansion, showing certain cases for which the rules have counter-intuitive consequences needing special care.

• Improperly nested constructs
• Unintended grouping of arithmetic
• Swallowing the semicolon
• Duplication of side effects
• Self-referential macros
• Separate expansion of macro arguments
• Cascaded use of macros
• Newlines in macro arguments

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