Nobuyuki Iwanaga

CompilerFeatureRequiredAttribute (modreq を使えないところがあったり、modreq を出しちゃうとバイナリ互換壊しかねない場所で、普通に属性でやるとか言ってる) runtime/issues/66167

How can this treat item format? ```cs Log($"{i:X4}"); ```

I want to avoid string allocation of `i.ToString("X4")`. As an alternative idea, I want `ISpanFormattable` to be public. ```cs Span buffer = stackalloc char[4]; ((ISpanFormattablei)i).Format(buffer, out var written, "X4"); Log(buffer.AsSpan(0,...

I found spec https://github.com/dotnet/csharplang/pull/4486/files#diff-77eda16068bf940c41c3c540d5a0f74c1bfee4b56388b0bc4e59e037abaa9ec7R124-R125. This makes sense. Thank you.

It may already be too late, but can the parameter of `AppendLiteral` be `char` in addition to `string`? e.g. now, ```cs string s = $"{a}.{b}.{c}.{d}" ``` is lowered to ```cs...

> Is your concern performance? Yes. Is https://github.com/dotnet/runtime/pull/57217 as fast as `char` overload? Can `ldstr "."` (`var s = "."`) be optimized as fast as `ldc.i4.s 46` (`char c =...

Is this related to https://github.com/dotnet/roslyn/issues/2209 ?

This is good idea! but I have some questions - How is this related to [Blittable Types in Interop Marshaling](https://msdn.microsoft.com/en-us/library/75dwhxf7)? The same? or similar but bit different? - Can `IntPtr`...

@HaloFour > What would happen if an errant compiler This problem already exists in the current C# compiler. Using the [`Unsafe`](https://www.nuget.org/packages/System.Runtime.CompilerServices.Unsafe/) class, managed types can be converted to pointer types....

Related to https://github.com/dotnet/corefxlab/blob/e109353256875ee42e6365c5facd243b1f0497ce/src/System.Slices/System/SpanExtensions_binary.cs#L21