[Issue 17063] Nested function template cannot be accessed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17063

Steven Schveighoffer <schveiguy at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |schveiguy at gmail.com

--- Comment #1 from Steven Schveighoffer <schveiguy at gmail.com> ---
Found another interesting case of this:

```
void main()
{
    int x = 5;
    bool foo(T)(T arg)
    {
        return arg == x;
    }
    import std.functional;
    unaryFun!foo(5); // ok!
    testit!foo(5); // error
}

auto testit(alias pred, T)(T arg)
{
    import std.functional;
    return unaryFun!pred(arg);
}
```

Note that instantiating unaryFun!foo directly in the function works, but
outside the function it doesn't. I can't see why it's different.

Changing foo to:

```
bool foo(int arg)
```

Works in both cases. Clearly the frame is accessible.

--