[Issue 19084] New: Symbol not resolved in string mixin in template struct

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19084

          Issue ID: 19084
           Summary: Symbol not resolved in string mixin in template struct
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: rburners at gmail.com

I have this code

```
import std.format : format;

struct Bar(T) {
    mixin(format("%s foo;", T.stringof));    // a) Error
    // T foo;                                // b) Compiles
}

unittest {
    struct Foo {
    }

    Bar!Foo bar;
}
```

which fails to compile with
"Error: undefined identifier Foo, did you mean variable foo?"

When I change a) to b) it compiles.

Not sure if this is a bug or not.

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