go/types: better error message for missing ~ in constraint
This is a port of CL 366758 from types2 to go/types. For #49179. Change-Id: I7e1c6ffb392d5c535cf901004b7acbe8c3be9b0f Reviewed-on: https://go-review.googlesource.com/c/go/+/367199 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Robert Findley <rfindley@google.com>
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