https://issues.dlang.org/show_bug.cgi?id=13279
--- Comment #2 from Kenji Hara <[email protected]> --- The assert was introduced in: https://github.com/D-Programming-Language/phobos/pull/1954 However, as far as I see, the code modifies dlist during its iteration. By the modification, original range would be invalid and the assertion detects "invalid state". --
