[C# 14-Fundamentals and reference]: New Feature - User defined compound assignment operators

[BillWagner]

Visual Studio release

other - specify below

Link to speclet

• Speclet

Link to Pull request

• PR

New behavior

Type authors can now define the behavior for compound assignment operators, such as += or *=.

Prior to this, authors could override +, and *, bur not =. The compound assignment operators have been defined to call the binary arithmetic operators and then the assignment operator.

This will allow authors to provide a "modify in place" implementation.

Language reference tasks

• This removes a restriction on these operators.
• It expands the list of overridable operators.
• Check all docs for where the (now invalid) restriction has been mentioned.

Everyday C# tasks

No response

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Associated WorkItem - 431829