Bug 24498 – Multidimensional array not scanned by GC

This is similar to issue 24436: ``` import std.stdio, core.memory; void main() { int[][][] a = new int[][][](2, 2); assert(!(GC.getAttr(a[0].ptr) & GC.BlkAttr.NO_SCAN)); // fails now } ``` The array has three dimensions, but only two are initialized. The middle arrays need to be scanned by the GC, but they are marked as NO_SCAN. The problem exists since https://github.com/dlang/dmd/commit/055accfbe6afe5f72c77617d54f737e71e29f5a3 A similar problem has already been solved in https://github.com/dlang/dmd/pull/16373 The initialization is lowered to _d_newarraymTX!(int[][][], int, int[][]). Maybe this should be _d_newarraymTX!(int[][][], int[], int[][]) instead, because the element type of the array should be int[] and not int.

@tim-dlang created dlang/dmd pull request #16400 "Fix bugzilla 24498 - Multidimensional array not scanned by GC" fixing this issue: - Fix bugzilla 24498 - Multidimensional array not scanned by GC For expression `new int[][][](2, 2)` the relevant element type is `int[]` and not `int`, because only two dimensions are allocated. https://github.com/dlang/dmd/pull/16400

*** Issue 24440 has been marked as a duplicate of this issue. ***

dlang/dmd pull request #16400 "Fix bugzilla 24498 - Multidimensional array not scanned by GC" was merged into stable: - f39cc10ef9b4d3e92d0172a41e6b9515de0ba8d0 by Tim Schendekehl: Fix bugzilla 24498 - Multidimensional array not scanned by GC For expression `new int[][][](2, 2)` the relevant element type is `int[]` and not `int`, because only two dimensions are allocated. https://github.com/dlang/dmd/pull/16400

dlang/dmd pull request #16406 "Merge stable" was merged into master: - f1307d6c75bef4aaddaba1451b71687e62d21790 by Tim Schendekehl: Fix bugzilla 24498 - Multidimensional array not scanned by GC (#16400) For expression `new int[][][](2, 2)` the relevant element type is `int[]` and not `int`, because only two dimensions are allocated. https://github.com/dlang/dmd/pull/16406