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Add 7.3 to language history (#1461)

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Julien Couvreur 2018-04-15 16:31:31 -04:00 committed by GitHub
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Language-Version-History.md
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@ -88,3 +88,14 @@ Features Added in C# Language Versions
- [Non-trailing named arguments](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.2/non-trailing-named-arguments.md)
- [Private protected accessibility](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.2/private-protected.md)
- [Digit separator after base specifier](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.2/leading-separator.md)
# C# 7.3 (Visual Studio 2017 version 15.7)
- `System.Enum`, `System.Delegate` and [`unmanaged`](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/blittable.md) constraints.
- [Ref local re-assignment](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/ref-local-reassignment.md): Ref locals and ref parameters can now be reassigned with the ref assignment operator (`= ref`).
- [Stackalloc initializers](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/stackalloc-array-initializers.md): Stack-allocated arrays can now be initialized, e.g. `Span<int> x = stackalloc[] { 1, 2, 3 };`.
- [Indexing movable fixed buffers](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/indexing-movable-fixed-fields.md): Fixed buffers can be indexed into without first being pinned.
- [Custom `fixed` statement](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/pattern-based-fixed.md): Types that implement a suitable `GetPinnableReference` can be used in a `fixed` statement.
- [Improved overload candidates](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/improved-overload-candidates.md): Some overload resolution candidates can be ruled out early, thus reducing ambiguities.
- [Expression variables in initializers and queries](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/expression-variables-in-initializers.md): Expression variables like `out var` and pattern variables are allowed in field initializers, constructor initializers and LINQ queries.
- [Tuple comparison](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/tuple-equality.md): Tuples can now be compared with `==` and `!=`.
- [Attributes on backing fields](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.3/auto-prop-field-attrs.md): Allows `[field: …]` attributes on an auto-implemented property to target its backing field.