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Compiler Error CS1641 

Error Message

A fixed size buffer field must have the array size specifier after the field name

Unlike regular arrays, fixed size buffers require a constant size to be specified at the declaration point. To resolve this error, add a positive integer literal or a constant positive integer and put the square brackets after the identifier.

The following sample generates CS1641:

// CS1641.cs
// compile with: /unsafe /target:library
unsafe struct S {
   fixed int [] a;  // CS1641
   
   // OK
   fixed int b [10];
   const int c = 10;
   fixed int d [c];
}

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