New issue Request: Make generic types with explicit layout a compiler error

[AdamSpeight2008]

Originally posted by @leppie (here)

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The following compiles, but results in a TypeLoadException:

[StructLayout(LayoutKind.Explicit)]
struct Union<T1, T2>
{
    [FieldOffset(0)]
    readonly T1 t1;
    [FieldOffset(0)]
    readonly T2 t2;
}

Could not load type 'Union2' ...because generic types cannot have explicit layout.`
Given it will always fail at runtime, should this not be considered to be a compiler error instead?

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