https://issues.dlang.org/show_bug.cgi?id=23238
--- Comment #4 from Dlang Bot <dlang-bot@dlang.rocks> --- @MartinNowak created dlang/phobos pull request #8563 "merge stable" fixing this issue: - fix issue 23238 - Cannot write a const Nullable(T, T nullValue) - Merge pull request #8545 from wolframw/fix_23238 Fix issue 23238 - Cannot write a const Nullable(T, T nullValue) https://github.com/dlang/phobos/pull/8563 --