[Issue 10488] Allow template this parameter to work with static functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=10488

--- Comment #8 from Dlang Bot <dlang-bot at dlang.rocks> ---
@ntrel created dlang/dmd pull request #14446 "Infer template this parameter
when calling static method on instance" mentioning this issue:

- Infer template this parameter when calling static method on instance

  Part of Issue 10488 - Allow template this parameter with static functions.

  Note: `tthis` is only used in `doHeaderInstantiation` for template this
  so assigning null when there's a static storage class is not needed for
  anything else.

https://github.com/dlang/dmd/pull/14446

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