[Issue 24473] New: it should not be possible to shadow the module name

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24473

          Issue ID: 24473
           Summary: it should not be possible to shadow the module name
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: accepts-invalid
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: b2.temp at gmx.com

It is allowed to shadow the module identifier, leading to situations where it
is unclear
what an IdentExp resolves to:

```d
module Test;

struct Test
{
    static int a;
}

int a;

void main()
{
    Test.a = 1; // actually not a FQN
}  
```

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