Protected struct allowed in static class

[5cover]

Hello,

static class foo
{
    protected void doThing() // CS1057
    {

    }
}

This code generates the CS1057 compiler error, as static classes don’t support inheritance.

So why is the following allowed?

static class foo
{
    protected struct bar
    {

    }
}

[svick]

Looking at the relevant code in the compiler, this seems to be a bug that was intentionally preserved from the previous version of the compiler to maintain compatibility.

[MaceWindu]

BTW, why it wasn't hidden behind <Features>strict</Features>?

[RikkiGibson]

It might be reasonable to include this scenario in a warning wave.