Bug 23599 – tuples not expanded in struct initializer

Found while implementing named arguments: https://github.com/dlang/dmd/pull/14776#issuecomment-1369269255 ``` struct S { int x, y; } alias Seq(T...) = T; void f() { S s0 = S( Seq!(1, 2) ); // < works S s1 = { Seq!(1, 2) }; // < error } ``` > Error: cannot implicitly convert expression `tuple(1, 2)` of type `(int, int)` to `int`

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