[Issue 16437] Enum type inference

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16437

--- Comment #1 from Basile B. <b2.temp at gmx.com> ---
Other possible cases:

  SomeEnum {se1, se2}
  SomeEnum x = se1 | se2; // OK, there's a hint to solve se1 and se2
  auto y = se1 | se2;     // Error (unless se1/se2 exist as var in the scope.

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