[Issue 21774] formatException is not constant instead of static assert error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21774

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
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                 CC|                            |moonlightsentinel at disroot.o
                   |                            |rg

--- Comment #1 from moonlightsentinel at disroot.org ---
Digger blames this commit:

commit 01effdd82273934ab9d82b7b4af283b28d9131f7
Author: Viktor <dayllenger at protonmail.com>
Date:   Thu Jul 11 12:32:21 2019 +0300

    dmd: Improve template constraint error messages (#9715)

    Improve template constraint error messages
    merged-on-behalf-of: Razvan Nitu <RazvanN7 at users.noreply.github.com>

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