[Issue 20583] New: no warnings printed when indexing through deprecated alias this

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20583

          Issue ID: 20583
           Summary: no warnings printed when indexing through deprecated
                    alias this
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: diagnostic
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: elpenguino+D at gmail.com

```
unittest {
        struct X {
        int[1] x;
        deprecated alias x this;
        }
    auto y = X()[0];
}
```
The expected deprecation warning is not printed.

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