[Issue 13381] Two cases of array literal that can be stack-allocated

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13381

--- Comment #17 from Nick Treleaven <nick at geany.org> ---
Allowing comment #13 code depends on fixing Issue 20712.

> and comment #19 do not.

I meant comment #15 does not:

>     immutable int[5] a2 = a1[0 .. i] ~ 3 ~ a1[i .. $];

I don't see how that could be allowed because `i` is a runtime value, so the
compiler has to make a GC array allocation (at least in the general case).

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