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This rule appears in the C++ Secure Coding Standard as PRE30-CPP. Do not create a universal character name through concatenation.
References
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| \[[ISO/IEC 10646-2003|AA. C References#ISO/IEC 10646-2003]\] \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] Section 5.1.1.2, ""Translation phases,"" Section 6.4.3, ""Universal character names,"" and Section 6.10.3.3, ""The ## operator"" | 
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PRE10-C. Wrap multi-statement macros in a do-while loop       01. Preprocessor (PRE)        PRE31-C. Never invoke an unsafe macro with arguments containing assignment, increment, decrement, volatile access, or function call