[Issue 19056] New: UDAs can be added to imports but not retrieved

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19056

          Issue ID: 19056
           Summary: UDAs can be added to imports but not retrieved
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: elpenguino+D at gmail.com

It is currently legal to attach UDAs to imports, but there's no way to retrieve
them.

ie:
```
enum X;
@X import y = std.stdio;

pragma(msg, __traits(getAttributes, y));
```

I would expect the compiler to either print the attributes or emit an error,
not print an empty tuple.

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