add code to handle new-style rustc errors

These errors are available on nightly builds (or will be soon), but
only (at the moment) when enabled via environment variable. They will
become the default at some point in the future.

In this commit we match on the `-->`, but after that we have to scroll
the compilation window to make the error visible. One shortcoming is
that if you enter the window and click on the filename/line-number, then
the "next-error-hook" doesn't seem to run. (If you click at the start of
the line, it does.) It may be possible to tweak the "hyperlink" here to
make that work more smoothly, or perhaps add a hook somewhere else.

0 files changed, 0 insertions, 0 deletions