Bug 18576 – Compiler not doing RVO with auto returns

As reported by Tomer Filiba: void delegate() callback; struct S { int x; @disable this(this); this(int x) { this.x = x; callback = &inc; } void inc() { x++; } } auto f() { return g(); // RVO not done } auto g() { return h(); // RVO not done } auto h() { return S(100); } void main() { auto s = f(); writeln(&s, " ", callback.ptr); // 7FFF0C838400 7FFF0C8383A0 callback(); writeln(s.x); // 100 instead of 101 }

*** Issue 17318 has been marked as a duplicate of this issue. ***

Commits pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/94f0bd6af7120ff27968052ad5645a554db12bed fix Issue 18576 - Compiler not doing RVO with auto returns https://github.com/dlang/dmd/commit/8b51a1d3d6f2c96214da0b3e49a62c1b021a70b0 Merge pull request #7990 from WalterBright/fix18576 fix Issue 18576 - Compiler not doing RVO with auto returns merged-on-behalf-of: Walter Bright <[email protected]>