Neal Gafter comments

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                                            Neal Gafter

Champion "and, or, and not patterns" (VS 16.8, .NET 5)

@ufcpp How would intersection and union types help with `case 1 or 2:`?

Champion "and, or, and not patterns" (VS 16.8, .NET 5)

@yaakov-h Regarding your first example, yes. The second example doesn't make sense as `IDictionary` is not a pattern.

Champion "and, or, and not patterns" (VS 16.8, .NET 5)

@MgSam What's worse is one that is ambiguous for both the developer and the compiler.

Champion "and, or, and not patterns" (VS 16.8, .NET 5)

@MgSam You suggestion gives two different contradictory interpretations for this code, one of which is accepted today. ``` c# if (myBool is true || false) ```

Treat stackalloc like array creation.

No, not more issues. It is just the grammar validation.

Default Interface Implementation "ShouldOverrideAttribute"

If this is to be required by the language and enforced by the compiler, then this is a language feature request and belongs in the `csharplang` repository. If it is...

Different reference types: nullable and non-nullable

We may need three types, not two. For example: ```csharp void f( #nullable disable string x, // could x (oblivious) be seen as nullable type but non-nullable initial state? #nullable...