[Issue 19292] Mixin expressions should take an argument list the same as pragma(msg) does

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19292

--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> ---
Test case:

int test() {
    return mixin("1", 2);
}

void testit() {
    static assert(test() == 12);
}

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