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\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 5.1.1.3, "Diagnostics"
\[[MITRE 07|AA. C References#MITRE 07]\] [CWE ID 563|http://cwe.mitre.orgdata/definitions/563.html], "Unused Variable"; [CWE ID 570|http://cwe.mitre.org/data/definitions/570.html], "Expression is Always False"; [CWE ID 571|http://cwe.mitre.org/data/definitions/571.html], "Expression is Always True"
\[[Sutter 05|AA. C References#Sutter 05]\] Item 1
\[[Seacord 05|AA. C References#Seacord 05]\] Chapter 8, "Recommended Practices"