[C# 14-Fundamentals and reference]: New Feature - First class span

[BillWagner]

Visual Studio release

17.13.p3

Link to speclet

• Speclet

Link to Pull request

• PR

New behavior

This was merged into VS 17.13.p1

This feature is active in LangVersion 14.

This introduces first-class support for Span<T> and ReadOnlySpan<T> in the language, including new implicit conversion types and consider them in more places, allowing more natural programming with these integral types.

Note that this PR didn't add any new errors or warnings. There's no corresponding issue to update those.

Language reference tasks

This impacts implicit conversions, explicit conversions, and user defined conversions involving Span types.

In addition, it will have some impact on the overload resolution algorithm.

However, these changes don't introduce new syntax or new ways to work with Spans. Instead, they mean Spans work more naturally in more constructs.

Everyday C# tasks

No response

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Associated WorkItem - 370945