What does null! statement mean? Languages

What does null! statement mean?

I've recently seen the following code:Basically I try to dig into new c# 8 features. One of them is NullableReferenceTypes. Actually there're a lot of articles and information about it already. E.g. this article is quite good. But I din't find any information about this new statement null! Can someone...
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Heap allocation for std::array Languages

Heap allocation for std::array

According to this question std::array is allocated on the stack. However when using it together with Valgrind it shows me a heap allocation, even for elements which are allocated on the stack. Is this a false positive or real?
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