digitalmars.D.bugs - [Issue 12909] New: [AA] Function is incorrectly inferred as strongly
- via Digitalmars-d-bugs (53/53) Jun 13 2014 https://issues.dlang.org/show_bug.cgi?id=12909
https://issues.dlang.org/show_bug.cgi?id=12909 Issue ID: 12909 Summary: [AA] Function is incorrectly inferred as strongly pure for associative array with immutable array keys as argument Product: D Version: D2 Hardware: All OS: All Status: NEW Keywords: wrong-code Severity: major Priority: P1 Component: DMD Assignee: nobody puremagic.com Reporter: verylonglogin.reg gmail.com This code should compile without warnings: --- int f(immutable(int[])[int] a) pure nothrow { a[0] = []; return 0; } void main() { immutable(int[])[int] aa; aa.f(); } --- main.d(10): Warning: calling main.f without side effects discards return value of type int, prepend a cast(void) if intentional --- This is a major issue as it creates release-only bugs also depending on `-inline` switch as optimizer can not call such functions if it isn't already inlined: --- import std.stdio; void f(immutable(string)[int] a) pure nothrow { // This `try` is needed to prevent inlining if compiled // with `-inline`: try debug writeln("f called."); catch { } a[1] = "a"; } void main() { immutable(string)[int] aa = [0 : ""]; aa.f(); writeln(aa); } --- Writes `[0:""]` if optimized. --
Jun 13 2014