[Issue 16137] New: Better error message: function literal accessing class variable

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16137

          Issue ID: 16137
           Summary: Better error message: function literal accessing class
                    variable
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nob...@puremagic.com
          Reporter: jbc.enge...@gmail.com

This code
```
class A
{
    int i;
    void foo()
    {
        auto a = function() { i++; }; // Line 6
    }
}
```
gives the error (DMD 2.071):
   foo.d(6): Error: need 'this' for 'i' of type 'int'

I think it should be improved, but I do not have a great idea for it. It think
instead of mentioning "need 'this'" it should mention something about
"delegate" or "function literal needs access to object data", ...

Thanks,
  Johan

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