5770d7a637
Accept embedded interface elements of the form ~T or A|B and treat them like type lists: for now the elements of a union cannot be interfaces. Also, translate existing style "type"- lists in interfaces into interface elements: "type a, b, c" becomes a union element "~a|~b|~c" which in turn is handled internally like a type list. For now, "~" is still ignored and type lists are mapped to Sum types as before, thus ensuring that all existing tests work as before (with some minor adjustments). Introduced a new Union type to represent union elements. For now they don't make it past interface completion where they are represented as a Sum type. Thus, except for printing (and the respective tests) and substitution for interfaces, the various type switches ignore Union types. In a next step, we'll replace Sum types with union types and then consider the ~ functionality as well. Because union elements are no different from embedded interfaces we don't need a separate Interface.types field anymore. Removed. For #45346. Change-Id: I98ac3286aea9d706e98aee80241d4712ed99af08 Reviewed-on: https://go-review.googlesource.com/c/go/+/321689 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com> |
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