In DMD 2.051 (and probably DMD 2.050 as well), calling GC.malloc with the 'has interior pointers' flag (i.e., 1) inside a unittest block causes an access violation error or a program crash.

This is a blocker for non-trivial use of the std.variant and std.json enhancements I'm working inside of unittests, including their own.

Test case:

import core.memory;
unittest {
    GC.malloc(16, 0); // Okay
    GC.malloc(16, 1); // object.Error: Access Violation
}