846f971daa
Introduce a monotonic state variable to track the lifecycle of a named type, replacing the existing sync.Once. Having a single guard for the state of underlying and methods will allow for cleaning-up when the type is fully expanded. In the future, this state may also be used for detecting access to information such as underlying or methods before the type is fully set-up, though that will require rethinking our type-checking of invalid cyclic types. Also remove support for type-type inference. If we ever support this feature in the future (inference of missing type arguments for named type instances), it will likely involve additional machinery that does not yet exist. Remove the current partial support to simplify our internal APIs. In particular, this means that Named.resolver is only used for lazy loading. As a result, we can revert the lazy loader signature to its previous form. A lot of exposition is added for how Named types work. Along the way, the terminology we use to describe them is refined. Some microbenchmarks are added that were useful in evaluating the tradeoffs between synchronization mechanisms. Updates #52728 Change-Id: I4e147360bc6e5d8cd4f37e32e86fece0530a6480 Reviewed-on: https://go-review.googlesource.com/c/go/+/404875 Run-TryBot: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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