Bug 24664 – Inconsistent "cannot be used as an lvalue in @safe code" deprecation

``` void main() @safe { int[3] a; (cast(uint[3]) a)[0] = 20; // allowed assert(a[0] == 20); // passes (cast(uint[3]) a) = [30, 40, 50]; // Deprecation: cast from `int[3]` to `uint[3]` cannot be used as an lvalue in @safe code assert(a[0] == 30); } ``` Either both should compile, or neither.

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