[Issue 14017] Assignment of a mutable array returned from non-`pure` function to `immutable` global variable is allowed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=14017

--- Comment #4 from Steven Schveighoffer <schveiguy at gmail.com> ---
To address the original statement as well, if f returns a character array, it
now compiles. And this is to be expected.

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