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Starting with C# 7.3, stackalloc arrays can use array initializer syntax.

I also ran acrolinx and fixed markdown lint issues. This will be easier to review with the rich diff.

Fixes #4772

Relies on samples in dotnet/samples#14

Starting with C# 7.3, stackalloc arrays can use array initializer syntax.

I also ran acrolinx and fixed markdown lint issues. This will be easier to review with the rich diff.
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LGTM, @BillWagner. Once again I left just one minor comment.

int* third = stackalloc[] { 1, 2, 3 };
```

Because pointer types are involved, `stackalloc` requires [unsafe](unsafe.md) context. For more information, see [Unsafe Code and Pointers](../../programming-guide/unsafe-code-pointers/index.md)
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requires unsafe --> requires an unsafe


`stackalloc` is like [_alloca](/cpp/c-runtime-library/reference/alloca) in the C run-time library.

## Example2
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As the section contains two examples: Example2 -> Examples

@BillWagner BillWagner merged commit a5bfeb6 into dotnet:master Apr 12, 2018
@BillWagner BillWagner deleted the csharp73-stackalloc-iniitalizers branch April 12, 2018 13:47
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Extend array initializers to stackalloc arrays

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