go/types, types2: improve error message for incomplete alias hashing Currently, there is a known issue when type checking programs like: type X A type A = N type N G[A] type G[_ any] int This change just improves the error message from "panic: nil" to "panic: cannot type hash incomplete alias (see go.dev/...)". This should prevent duplicate reports like #79655 and #80150. For #78296 Change-Id: Id89d1d45d60a59164b802f2ea25f27c70ae46cdf Reviewed-on: https://go-review.googlesource.com/c/go/+/794400 Reviewed-by: Robert Griesemer <gri@google.com> Auto-Submit: Mark Freeman <markfreeman@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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