commit b673f911c9a401422d0fc09d432fb0b87f5bf057
author Alex Fandrianto <alexfandrianto@google.com> Fri Jul 22 15:38:03 2016 -0700
committer Alex Fandrianto <alexfandrianto@google.com> Fri Jul 22 15:38:03 2016 -0700
tree 35d520094deb14108040e71cfdda319d4f08091d
parent be1aa2e6de14ae5d86795794485074ce6988b3ce

x/ref: cgo Errors escape non-utf8 runes

Java in particular is extremely upset by characters like 0xfe.
So much so that it will crash, so we are going to replace such
invalid characters with the Unicode unknown character.

In order to help find out the root cause of these invalid
characters, I have added:
- panic on normal strings if they have an invalid char. This
  should never actually happen, so it's worth panicking.
- vlog.Errorf for the error messages and stacks. We escape these
  for now, since we know of multiple errors that might lead to an
  invalid character in these strings.

Change-Id: Ic1e0f19c6f62324dd7bf56ec6aee5a9cd07eab74