Bug 17564 – std.experimental.allocator.theAllocator is null within shared static this

vibe.d needs to use "shared static this" for initialization to support the original initialization scheme for applications that it still in wide use. With 2.075.0-b1, since processAllocator now returns an ISharedAllocator, it had to switch to theAllocator where possible. However, since this returns null during the "shared static this" phase, this causes a crash on startup. Setting theAllocator to something else also doesn't work, because of an assertion in std.experimental.allocator. Proposed change is to make initialization lazy, just as for processAllocator.

Commits pushed to stable at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/4a5d2b3b189f072e9bd0b1779a7d585e3945921b Fix issue 17564: Eliminate "static this" for theAllocator This switches to lazy initialization of theAllocator, so that accessing it form within `shared static this` works as expected. https://github.com/dlang/phobos/commit/2e0a49cd397ea1bdb993e3a9271193cf6051b8ce Merge pull request #5519 from s-ludwig/lazy_the_allocator Issue 17564: Eliminate "static this" for theAllocator merged-on-behalf-of: Martin Nowak <[email protected]>

Commits pushed to master at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/4a5d2b3b189f072e9bd0b1779a7d585e3945921b Fix issue 17564: Eliminate "static this" for theAllocator https://github.com/dlang/phobos/commit/2e0a49cd397ea1bdb993e3a9271193cf6051b8ce Merge pull request #5519 from s-ludwig/lazy_the_allocator

Commits pushed to dmd-cxx at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/4a5d2b3b189f072e9bd0b1779a7d585e3945921b Fix issue 17564: Eliminate "static this" for theAllocator https://github.com/dlang/phobos/commit/2e0a49cd397ea1bdb993e3a9271193cf6051b8ce Merge pull request #5519 from s-ludwig/lazy_the_allocator