0c6a6cd4d8
We don't have guarantees that our type hash is perfect, and in fact fuzzing found cases where identical types hashed to different values. In case non-identical types hash to the same value, we should ensure that we de-duplicate using Identical. Adjust the type map to keep a slice of distinct type identities, so that we can guarantee that type identity is preserved by de-duplication. To allow look-up of instances by their identity, before they are actually instantiated, add a Context.lookup method that accepts origin type and type arguments. Replace the multi-function typeForHash method with an update method that requires its argument be non-nil. Change-Id: I8fe6fb2955f508db608161b7285b02d0a2fa0e46 Reviewed-on: https://go-review.googlesource.com/c/go/+/362798 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
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