This special-cases the error for importing/exporting dart: libraries
that are not available on the current platform and includes a detail
description of how the unavailable library was imported in the
context of the error message.
Currently there is no special casing of the message depending on the
unavailable library and the current platform, as this is meant as
a catch-all message. In a follow-up I'll add special casing of the
message for some of these cases.
In response to https://github.com/dart-lang/sdk/issues/47260
Change-Id: Ia296f9ca1b03bf664e12241a139970ef31c8a2d3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/261821
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Jens Johansen <jensj@google.com>
Johnni Winther