https://issues.dlang.org/show_bug.cgi?id=16224
Issue ID: 16224 Summary: -cov marks the last line of do/while(0); as uncovered Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nob...@puremagic.com Reporter: and...@erdani.com Consider: int fun(int x) { do { if (x != 0) break; if (x != 1) break; if (x != -1) break; return x; } while (0); return x * x * x; } unittest { fun(0); fun(1); fun(2); } The do/while(0); idiom is a trick used to avoid goto or additional state variables. It simply allows code to jump to a common point by using "break". The coverage analyzer marks the line with "while (0);" as uncovered, although that is an useless tidbit. --