Bug 16142 – Adding a dtor / postblit (even disabled) forces opAssign

``` struct A { @disable this(this); @disable void opAssign(const A); } struct B { A a; } void main() { B b; b = B(); } ``` This compiles and run without problem, even though `A` has its `opAssign` disabled.

P.R: https://github.com/dlang/dmd/pull/5854

Commits pushed to master at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/348bd95e0663f8748957b0f44e24b55c24811c58 Issue 16142: Correct test for hasElaborateAssign Nested member's `@disable opAssign` should propagate to parents. https://github.com/dlang/phobos/commit/a26026478cd337b89396e70c9e9186ebde172c51 Merge pull request #4421 from mathias-lang-sociomantic/dmd-pr-5854 Issue 16142: Correct test for hasElaborateAssign

Commits pushed to master at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/517f14a949a2998e51517cbef444f2b3208a3789 Fix issue 16142: Disabled opEquals is overriden when a dtor/postblit is present In order to pick up disabled opEquals, we need to process the members of the struct anyway even if there is a dtor / postblit. https://github.com/dlang/dmd/commit/113cf3f4f8b4a786d7d7dca6bfc62ed024d12af9 Merge pull request #5854 from mathias-lang-sociomantic/opassign-2 Fix issue 16142: Disabled opAssign is overriden when a dtor/postblit is present

Commits pushed to master at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/dbb412d49ce76e1bf939ee5dd8fb10093e27bdbe Issue 16142 - Enable test for disabled recursive identity opAssign https://github.com/dlang/phobos/commit/fbccadbc5e2fd8628423be24d961ff0db90c01e7 Merge pull request #4543 from Geod24/correct-opassign Issue 16142 - Enable test for disabled recursive identity opAssign

Commits pushed to stable at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/348bd95e0663f8748957b0f44e24b55c24811c58 Issue 16142: Correct test for hasElaborateAssign https://github.com/dlang/phobos/commit/a26026478cd337b89396e70c9e9186ebde172c51 Merge pull request #4421 from mathias-lang-sociomantic/dmd-pr-5854 https://github.com/dlang/phobos/commit/dbb412d49ce76e1bf939ee5dd8fb10093e27bdbe Issue 16142 - Enable test for disabled recursive identity opAssign https://github.com/dlang/phobos/commit/fbccadbc5e2fd8628423be24d961ff0db90c01e7 Merge pull request #4543 from Geod24/correct-opassign

Commits pushed to stable at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/517f14a949a2998e51517cbef444f2b3208a3789 Fix issue 16142: Disabled opEquals is overriden when a dtor/postblit is present https://github.com/dlang/dmd/commit/113cf3f4f8b4a786d7d7dca6bfc62ed024d12af9 Merge pull request #5854 from mathias-lang-sociomantic/opassign-2