[Issue 19340] New: Protected module members are supposed to be illegal

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19340

          Issue ID: 19340
           Summary: Protected module members are supposed to be illegal
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: aldacron at gmail.com

I've marked this as a regression because the docs [1] say:

"protected module members are illegal."

However, the compiler not complain about protected module members:

```
module a;

// This compiles
protected int wrong;
```

```
module b;
import std.stdio;
import a;

int main() { writeln(wrong); }
```

Instead, it gives the deprecation message about visibility:

"Deprecation: a.wrong is not visible from module b"

With -d, it compiles and runs.


[1] https://dlang.org/spec/attribute.html#visibility_attributes

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