The main change here is that a bad type appearing somewhere within a
field or base class of a class shouldn't cause an import of that class
to fail. Instead, only that field or base class becomes inaccessible
from Carbon.
Also improve the way that type importing errors are diagnosed. While we
lose the precision of a diagnostic saying why a type is not supported,
we gain a useful source location for where the type was mentioned in C++
code.
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Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Richard SmithandJon Ross-Perkins
b2b0b4a73f