go/types: improve error messages for unexpected ListExprs
This CL is a mix of CL 312149 and CL 314409, adding the Checker.singleIndex method to provide better error messages when an unexpected ListExpr is encountered. Change-Id: I45d6de9b4dfc299dc2d356ca14d05c9191de818d Reviewed-on: https://go-review.googlesource.com/c/go/+/314869 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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