reflect: factor out special channel assignability rule from haveIdenticalUnderlyingType
Go specification says: A value x is assignable to a variable of type T if x is a bidirectional channel value, T is a channel type, x's type V and T have identical element types, and at least one of V or T is not a defined type. However, the current reflection implementation is incorrect which makes "x is assignable to T" even if type V and T are both defined type. The current reflection implementation also mistakes the base types of two non-defined pointer types share the same underlying type when the two base types satisfy the above mentioned special channel assignability rule. Fixes #29469 Change-Id: Ia4b9c4ac47dc8e76a11faef422b2e5c5726b78b3 GitHub-Last-Rev: 487c20a564091a1d2ba5feb95ab5196331c699c2 GitHub-Pull-Request: golang/go#29739 Reviewed-on: https://go-review.googlesource.com/c/go/+/157822 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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