[Issue 21652] dmd aborts with "e: cast, cast(immutable(bool))0"

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21652

--- Comment #1 from Berni44 <bugzilla at bernis-buecher.de> ---
Here a reduced testcase:

bool[][] a = b;

static b()
{
    int[1][1] c;

    return c;
}

produces "e: cast, cast(bool)0"

Since 2.089.1

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