[Issue 11812] New: Associative array .keys needs 'this' at compile time

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11812

           Summary: Associative array .keys needs 'this' at compile time
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: tcdknutson at gmail.com


--- Comment #0 from Dylan Knutson <tcdknutson at gmail.com> 2013-12-24 11:49:03 PST ---
DMD compiler 2.064, Windows 7 64 bit

```
enum myaa = ["foo": "bar"];

template MyTemplate(alias Arr)
{
    enum MyTemplate = Arr.length;
}

void main()
{
    // Fails
    auto a = MyTemplate!(myaa.keys);
}

version(none):
void main()
{
    // Works
    enum keys = myaa.keys;
    auto a = MyTemplate!keys;
}
```

Passing an AA's .keys to a template directly fails, but making `keys` a
separate enum allows them to be passed.

Error:

aabug.d(5): Error: need 'this' for 'keys' of type 'pure nothrow @property
@system string[]()'
aabug.d(10): Error: template instance aabug.MyTemplate!(keys) error
instantiating

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