We lost this error message in SI-3346 / 210dbc7887 under the comment:

> 2) neg/divergent_implicit.scala, neg/t5578.scala and neg/t7519.scala
>    changed their messages to less informative ones, because inapplicable
>    implicit views now get disqualified early and therefore don't display
>    their error messages to the user. This is an unfortunate but necessary
>    byproduct of this change, and one can argue that the behavior is now
>    completely consistent with implicit vals (that also don't explain why
>    this or that implicit val got disqualified, but rather display a generic
>    implicit value not found message).

2.11.0-RC3 issues this if the preceding line in the test is commented out. So there was some cross-talk in play, and restoring it here is a win.