Mixin/static if issue

[DLearner]

Please see below:
```
void main() {
    import std.stdio;

    uint TestVar = 5;

    string mxnWrite_Size_t(string VarName) {

       static if (typeof(VarName).stringof == "uint") {

          return `write("` ~ VarName ~ `");`;
       } else {

          return `writeln("Apparently TestVar not a uint");`;	
	  }
    }

    mixin(mxnWrite_Size_t("TestVar"));
}
```
What I expected was the string "TestVar".
What I got was the "Apparently..." error message.
Please, why is this?