[Issue 21500] New: public import in mixin template in module a fails when module b import sa.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21500

          Issue ID: 21500
           Summary: public import in mixin template in module a fails when
                    module b import sa.
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: noobnoobsai at gmail.com

Is this supposed to work?

```bar.d

mixin template baz() {
    public import std.stdio;
    // public import std.stdio : writeln;

}


}

```

```foo.d

import bar;

mixin baz; // 

void main(){

    // foo.d(8): Error: writeln is not defined, perhaps import std.stdio; is
needed?
    writeln("foo");  // public import statement in mixin fails
}

```

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