On Friday, 22 September 2017 at 14:43:28 UTC, Johan wrote:
Hi all,
```
  auto foo(const int[3] x)
  {
      int[3] y = x;
      y[0] = 1; // line 4
      return y;
  }
  immutable int[3] a = [0,1,2];
  immutable int[3] b = foo(a); // line 8
```
compiles with an error:
```
4: Error: cannot modify read-only constant [0, 1, 2]
8:        called from here: foo(a)
```

What am I doing wrong?

Thanks,
  Johan

Looks like a compiler bug to me. Please file a bug report on https://issues.dlang.org/enter_bug.cgi

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