[Issue 21674] [REG v2.086] `alias this` triggers wrong deprecation message on function call

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21674

--- Comment #8 from Iain Buclaw <ibuclaw at gdcproject.org> ---
What would be considered the right behaviour for statics?

---
struct Test
{
    private static int _impl;
    static ref int state() { return _impl; }
    void check(int expected) { assert(_impl == expected); }
    alias foo this;
}

struct Test2
{
    Test test;
    alias test this;
}

Test t;
t = 42;        // foo() = 42
t.check(42);

Test2 t2;
t2 = 42;       // foo() = 42;
t2.check(42);
---

Of course specs are not too specific about it.  Based on the content of issue
19441, my intuition would be don't deprecate it, because we only care about the
DotVarExp cases.

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