Bug 11611 – dmd -O causes std.stdio.File.byLine to segfault

CODE: ----- import std.stdio; void func(R)(R input) { } version=bad; void main() { try { version(bad) func(File("").byLine()); version(good) { auto f = File(""); func(f.byLine()); } } catch(Exception e) { } } ----- Compile command: ----- dmd -O test.d ----- Changing to version=good makes the problem go away; dropping the -O flag in the compile command also makes the problem go away. Based on this, it would appear that the problem comes from the optimizer interacting badly with the RefCounted implementations of File/ByLine. I'm unsure where the bug lies: in the optimizer, or in std.stdio; but my guess is that the optimizer is producing wrong code with structs containing dtors.

Gah, seems to be duplicate of issue #10723. *** This issue has been marked as a duplicate of issue 10723 ***