Schemas must form a tree. This is important for Schema.Resolve, and
also for modifying parts of the schema before resolution, as with
mcp SchemaOptions.
Remove the `seen` argument from inference, creating all schemas
afresh.
Change-Id: Ief8295e8470f3f575ef51cc2ba697901250bbe6f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/676937
Auto-Submit: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
a9a69a03e4