[Issue 24238] Confusing "not an lvalue"error messages

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24238

Dennis <dkorpel at live.nl> changed:

           What    |Removed                     |Added
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           Keywords|                            |diagnostic

--- Comment #1 from Dennis <dkorpel at live.nl> ---
* Accidentally submitted to early *

See: https://forum.dlang.org/thread/ealqnukwfgosusrzzsbh@forum.dlang.org

```
void templateFunc(T)() {}

void addr()
{
    auto x0 = &templateFunc;
}
```

The error says "is not an lvalue and cannot be modified", but it should say
instead that it's a template, and you cannot take the address of it before
instantiating it.

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